CompTIA® Network+® 2009 In Depth > Network+ Practice Exam

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Appendix B. Network+ Practice Exam

The following exam contains questions similar in content and format to what you will encounter on CompTIA’s Network+ certification exam. The exam consists of 100 questions, all of which are multiple choice. Some questions have more than one answer, and some questions require that you study a figure to determine the right answer. The questions are in no particular order. The number of questions on each topic reflects the weighting that CompTIA assigned to these topics in its 2009 exam objectives. If you want to simulate taking the CompTIA Network+ certification exam, you should allow yourself 90 minutes to answer all of the questions. You can find the answers to these questions in Appendix F, “Answers to Network+ Practice Exam Questions.”

1.	What TCP/IP utility would you use to determine the number of hops between two routers? FTP Nslookup Nbtstat Tracert Telnet
2.	Your network manager has purchased a dozen new access points, and all are configured to use the new 802.11n standard in either the 2.4GHz or 5GHz band. These access points will be capable of communicating with older access points that run which of the following standards? (Choose all that apply.) 802.11g 802.11a 802.11.b Bluetooth None of the above
3.	Which of the following figures reflects the type of physical topology commonly used on a 100Base-TX network?
4.	You have connected to your bank’s home page. Its URL begins with “https://.” Based on this information, what type of security can you assume the bank employs for receiving and transmitting data to and from its Web server? Kerberos SSL IPSec L2TP Packet-filtering firewall
5.	You are a support technician for an ISP (Internet service provider) called Alpha Enterprises. A new customer calls to ask why his dial-up connection to your company’s RADIUS access server won’t work. After the user double-clicks the ISP dial-up networking connection icon on his Windows XP desktop, you can hear his modem dialing. And even though another machine seems to answer, his connection never gets established. You verify that his phone line is connected properly and that he has entered the correct phone number. You also make sure he is using the correct, case-sensitive user name and password that he just received from your Customer Service department. What do you ask him to check next to get closer to solving his problem? The type of server specified in his Alpha Enterprises Properties dialog box The version of Windows XP his system uses Whether the Save Password check box is checked in his Connect to Alpha Enterprises dialog box Whether he has disabled the call-waiting feature in his Alpha Enterprises Properties dialog box The maximum baud rate his modem can handle
6.	You are rearranging nodes on your Fast Ethernet network. Due to a necessarily hasty expansion, you have decided to supply power to a wireless router in a makeshift telco room using PoE (power over Ethernet). What is the minimum cabling standard you must use to connect this wireless router to the network’s backbone? Cat 3 RG-59 RG-6 Cat 5 Single mode fiber-optic cable
7.	Which of the following best describes the function(s) of the MAC sublayer? It performs data compression, reformatting, and encryption. It appends a node’s physical address to frames before they are transmitted. It interprets program requests and requirements to provide an interface between applications and the network. It manages flow control and issues requests for retransmission of data that has suffered errors. It translates network addresses into their physical counterparts and determines routing.
8.	You are a networking technician in a radiology clinic, where physicians use the network to transmit and store patients’ diagnostic results. Shortly after a new wing, which contains X-ray and magnetic resonance imaging (MRI) machines, is added to the building, computers in that area begin having intermittent problems saving data to the file server. After you have identified the symptoms, what is your next step in troubleshooting this problem? Determine the number of workstations affected, to which segment the affected workstations belong, and which area of workstations is affected. Notify colleagues in the clinic’s IT department about a change you are going to make while attempting to resolve the problem. Research the problem on your NOS vendor’s technical support Web site. Identify recent changes to the network to determine whether a hardware or software change may be responsible for the problem. Identify the potential effects of the solution you are about to apply to make sure that you do not inadvertently create new problems.
9.	As a network administrator, you are most likely to use an RS-232-compatible cable in which of the following instances? Connecting a workstation to a hub’s uplink port Connecting a RADIUS server to a router Connecting a workstation to a router’s console port Connecting a switch to a router’s uplink port Connecting a broadband cable set-top box to the cable company’s backbone
10.	In which of the following situations would a crossover cable be useful for troubleshooting a network connectivity problem with a workstation? To connect the workstation to a hub To connect the workstation’s hub port to a punch-down block To connect the workstation to another workstation To connect the workstation’s switch port to its hub port To connect between the workstation’s wall plate and its hub port
11.	Which of the following WAN topologies is the most fault tolerant? Full mesh Bus Peer-to-peer Ring Hierarchical
12.	Which of the following is a valid MAC address? C3000000FFFF 111.111.111.111 ::9F53 AEFFG0930110 D0000000
13.	What type of network could use the type of connector shown here? 100Base-FX 100Base-TX 10Base-T 10Base-5 10Base-2
14.	Your organization has just ordered its first T1 connection to the Internet. Prior to that, your organization relied on a DSL connection. Which of the following devices must you now have that your DSL connection didn’t require? Modem CSU/DSU Switch Hub MAU
15.	What type of addresses do bridges read, and to which layer of the OSI model do bridges belong? IP addresses; the network layer IP addresses; the transport layer MAC addresses; the network layer MAC addresses; the data link layer IP addresses; the data link layer
16.	What is the maximum size of a data unit on an Ethernet network? 16 bytes 120 bytes 1,500 bytes 6,000 bytes 16,000 bytes
17.	You have been asked to provide a connectivity solution for a small, locally owned franchise of a national restaurant chain. The owners of the franchise want to send their confidential sales figures, personnel information, and inventory updates to the national office, which is 1,200 miles away, once per week. Their total monthly data transfer will amount to almost 50 megabytes. The franchise owners do not plan to use the connection for any other purposes, and they do not have IT staff to support the connection. Also, they do not want to spend more than $75 per month, nor more than $500 to install their connection. Considering cost, speed, reliability, technical expertise, distance, security, and the nature of their environment, what is the best solution for this client? A T1 that connects to the national office via a router at the local franchise and a router at the national office and that uses IPSec to ensure the security of the data en route A PSTN connection to a local Internet service provider that uses PPP to dial in to an access server and then sends data via e-mail to the national office A DSL connection to a local telephone and Internet service provider that uses IPSec to encrypt the data before it is sent to the national office’s file server over the Internet A private SONET ring to connect with two local telephone and Internet service providers that connects to the national office’s T3 and sends data via TCP/IP over ATM An ISDN connection to a local Internet service provider that allows you to copy files to the national office’s anonymous FTP site
18.	IEEE’s physical layer standards for the Ethernet access method are established by which IEEE committee? 802.2 802.3 802.5 802.7 802.11
19.	You are a software programmer using a development Web server at your office to test your programs. Although your Web server is connected to the Internet for test purposes, you want to ensure that no one on the Internet can access your Web files. To make it more difficult for someone to connect to your Web server from the Internet, which TCP/IP default port number would you change in your Web server software configuration? 21 22 65 80 90
20.	What is the maximum segment length on a 10Base-T network? 85 meters 100 meters 185 meters 200 meters 1,000 meters
21.	You are the network administrator for a large college whose network contains nearly 10,000 workstations, over 100 routers, 80 switches, and 2,000 printers. You are researching a proposal to both upgrade the routers and switches on your network and improve the management of your network. What type of protocol should you ensure that the new routers and switches can support to more easily automate your network management? TFTP SMTP NNTP ICMP SNMP
22.	In the process of troubleshooting an intermittent performance problem with your network’s Internet connection, you attempt to run a traceroute test to www.microsoft.com. The traceroute response displays the first 12 hops in the route but then presents several “Request timed out” messages in a row. What is the most likely reason for this? Your network’s ISP is experiencing connectivity problems. The Internet backbone is experiencing traffic congestion. Your client’s TCP/IP service limits the traceroute command to a maximum of 12 hops. Your IP gateway failed while you were attempting the traceroute test. Microsoft’s network is bounded by firewalls that do not accept incoming ICMP traffic.
23.	What is the network ID for a network that contains the group of IP addresses from 194.73.44.1 through 194.73.44.254 and is not subnetted? 194.1.1.1 194.73.0.0 194.73.44.1 194.73.44.255 194.73.44.0
24.	Which of the following disaster recovery contingencies is the most expensive to maintain? Hot spare Warm spare Hot site Warm site Cold site
25.	What type of device is typically used to create a VLAN? Hub Bridge Switch Router Firewall
26.	In NAT, how does an IP gateway ensure that outgoing traffic can traverse public networks? It modifies each outgoing frame’s Type field to indicate that the transmission is destined for a public network. It assigns each outgoing packet a masked ID via the Options field. It interprets the contents of outgoing packets to ensure that they contain no client-identifying information. It replaces each outgoing packet’s Source address field with a valid IP address. It modifies the frame length to create uniformly sized frames, called cells, which are required for public network transmission.
27.	You have purchased an access point capable of exchanging data via the 802.11b or 802.11g wireless standard. According to these standards, what is the maximum distance from the access point that wireless stations can travel and still exchange data with the access point at the maximum potential throughput? 10 feet 50 feet 80 feet 100 feet 175 feet
28.	Which of the following functions does SIP perform on a VoIP network? (Choose all that apply.) Determines the locations of endpoints Provides call waiting and caller ID services Prioritizes calls for any single endpoint in a queue Establishes sessions between endpoints Encrypts VoIP signals before they are transmitted over the network
29.	At what layer of the OSI model do routers operate? Presentation Session Network Data link Physical
30.	Which of the following is used to resolve NetBIOS names with IP addresses? DNS SMTP DHCP WINS Hosts file
31.	Which of the following figures illustrates a VPN WAN?
32.	Suppose you want to copy files from a Linux server at the office to your home computer, which also runs Linux, across a VPN. Both computers run OpenSSH. Which utility would you use to make sure these files are copied securely? SCP SFTP FTP TFTP HTTP
33.	What security measure verifies that your user name and password are contained in the NOS directory when you attempt to log on to a server? Remapping Encryption Authentication Caching Redirection
34.	You are a network administrator for a WAN that connects two regional insurance company offices—one main office and one satellite office—to each other by a T1. The main office is also connected to the Internet using a T1. This T1 provides Internet access for both offices. To ensure that your private network is not compromised by unauthorized access through the Internet connection, you install a firewall between the main office and the Internet. Shortly thereafter, users in your satellite office complain that they cannot access the file server in the main office, but users in the main office can still access the Internet. What two things should you check? Whether the firewall has been configured to run in promiscuous mode Whether the firewall is placed in the appropriate location on the network Whether the firewall has been configured to allow access from IP addresses in the satellite office Whether the firewall has been configured to receive and transmit UDP-based packets Whether the firewall has been configured to allow Internet access over the main office’s T1
35.	What TCP/IP utility was used to generate the following output, and what piece of information does it tell you about the machine on which the utility shown here was used? [View full size image] Ipconfig; the output indicates that the machine has a MAC address of 00080DE72F0C PING; the output indicates that the machine cannot communicate with external hosts ARP; the output indicates that the machine resolves to a name of Studentx Ifconfig; the output indicates that the machine does not rely on DHCP Nbtstat; the output indicates that it is currently connected to the machine with a NetBIOS name of Studentx
36.	While troubleshooting a workstation connectivity problem, you type the following command: `ping 127.0.0.1`. The response indicates that the test failed. What can you determine about that workstation? Its network cable is faulty or not connected to the wall jack. Its TCP/IP protocol is not installed properly. Its IP address has been prevented from transmitting data past the default gateway. Its DHCP settings are incorrect. Its DNS name server specification is incorrect.
37.	You are a support technician working in a telecommunications closet in a remote office. You suspect that a connectivity problem is related to a broken RJ-45 plug on a patch cable that connects a switch to a patch panel. You need to replace that connection, but you forgot to bring an extra patch cable. You decide to install a new RJ-45 connector to replace the broken RJ-45 connector. What two tools should you have to successfully accomplish this? Punch-down tool Crimping tool Wire stripper Cable tester Multimeter
38.	What types of switches propagate flawed packets and, therefore, can contribute to greater network congestion? Cut-through switches Transparent bridging switches Store-and-forward switches Layer 3 switches Trunking switches
39.	In the IP version 6 addressing scheme, which of the following IP addresses equals the loopback address? 1.0.0.1 127:0:0:0:0:0:0:1 0.0.0.0.0.1 ::1 127.0.0.1
40.	Which two of the following devices operate only at the physical layer of the OSI model? Hub Switch Router Bridge Repeater
41.	Which of the following is a reason for using subnetting or supernetting? To facilitate easier migration from IPv4 to IPv6 addressing To enable a network to use DHCP To make more efficient use of limited numbers of legitimate IP addresses To reduce the likelihood for user error when modifying TCP/IP properties To limit the number of addresses that can be assigned to one network interface
42.	In which two of the following switching techniques must multiple data packets that make up the same transmission use identical paths to reach their destination? Circuit switching Layer 2 switching Packet switching Message switching Layer 3 switching
43.	Which of the following wireless networking technologies can make use of WPA to improve the security of data in transit? 802.11b 802.5 Infrared Bluetooth 802.3
44.	In the following network diagram, which network nodes belong to a private network? Nodes 1 through 6 and nodes 8 through 14 Nodes 1 through 6 only Nodes 8 through 14 only Nodes 1 through 7, plus 15 and 16 All of the nodes
45.	You are the network administrator for a law firm whose two primary offices are located five blocks apart in the center of a large city. The two offices have different specialties and, therefore, keep separate file servers. Each file server runs the Windows Server 2003 NOS. A T1 connects the two offices so employees at each office can communicate and share files. To protect the lawyers’ records, you currently make regular backups of all the data on both file servers and store the backup tapes in an off-site warehouse. However, one of the firm’s partners asked you to do more than simply back up data. In addition, she requests that you implement this added measure within the next week. Which of the following solutions is the best choice to ensure greater data protection in the given time frame? Contract with an online backup provider to back up data over the Internet using the T1. Add a UNIX server to the network so that you can establish clustering between all the servers. Establish mirroring between the two servers using the T1. Add a RAID level 5 device to one of the file servers. Connect the T1 to a third office across town, and back up files from the two other locations to the third location.
46.	Due to popular demand from employees who need to roam from one floor of your office building to another, you are expanding your wireless network. You want to ensure that mobile users enjoy uninterrupted network connectivity without having to reconfigure their workstations’ wireless network connection settings. Which of the following variables must you configure on your new access points to match the settings on existing access points? Administrator password Scanning rate SSID IP address Signal strength
47.	Which transport protocol and TCP/IP port does the Telnet utility use? UDP, port 23 TCP, port 21 UDP, port 22 TCP, port 23 UDP, port 21
48.	Which two of the following would guarantee that a server continually has power, even if a building’s electrical service is interrupted? RAID level 3 RAID level 5 Online UPS Standby UPS Gas-powered generator
49.	What protocol is used to transfer mail between a Sendmail server and a Microsoft Exchange server? SMTP SNMP IMAP4 POP3 TFTP
50.	What is the function of RARP? To associate a host name with a given IP address To associate a MAC address with a given IP address To associate an IP address with a given MAC address To associate a NetBIOS name with a given MAC address To associate a MAC address with a given host name
51.	Your 100Base-TX network is wired following the TIA/EIA 568B standard. As you make your own patch cable, which wires do you crimp into pins 1 and 2 of the RJ-45 connector? White with green stripe and green White with brown stripe and brown White with blue stripe and blue White with red stripe and red White with orange stripe and orange
52.	A regional bank manager asks you to help with an urgent network problem. Because of a sudden and severe network performance decline, the manager worries that the bank’s network might be suffering a denial-of-service attack. Viewing which of the following types of network documentation would probably give you the quickest insight into what’s causing this problem? Wiring schematic Firewall log Logical network diagram The main file server’s event log Physical network diagram
53.	Which of the following is an application layer protocol used to access information stored in a directory? LDAP PPTP L2TP PPPoE ICMP
54.	What is the function of protocols and services at the network layer of the OSI model? To manage the flow of communications over a channel To add segmentation and assembly information To encode and encrypt data To add logical addresses and properly route data To apply electrical pulses to the wire
55.	Which of the following utilities could you use to log on to a UNIX host? NTP ARP PING Telnet SNMP
56.	As a networking professional, you might use a multimeter to do which of the following? (Choose all that apply.) Determine where the patch cable for a specific server terminates on the patch panel Verify that the amount of resistance presented by terminators on coaxial cable networks is appropriate Check for the presence of noise on a wire (by detecting extraneous voltage) Confirm that a fiber-optic cable can transmit signals from one node to another Validate the processing capabilities of a new router
57.	On your UNIX workstation, what command(s) would you type at the shell prompt to send a file to the printer queue? (Choose all that apply.) `prn` `filename` `lpr` `filename` `lpd` `filename` `ftp` `filename` `ps` `filename`
58.	What is the default subnet mask for the following IP address: 154.13.44.87? 255.255.255.255 255.255.255.0 255.255.0.0 255.0.0.0 0.0.0.0
59.	Which of the following diagrams illustrates a SONET network?
60.	You are a support technician installing 13 new Windows Vista workstations on your company’s network, which relies on several Windows Server 2008 servers for authentication and file sharing, one Gentoo Linux e-mail server, and one Gentoo Linux proxy server. The network runs the TCP/IP protocol over 100Base-TX Ethernet technology. It also uses DHCP and NAT. Which of the following settings must you manually specify on each workstation so that their users can pick up their Internet e-mail from the Linux e-mail server? DNS server address IP address WINS server name NTP server address SMTP server name
61.	Which of the following protocols does not operate at the application layer of the OSI model? POP3 SMTP ARP NTP DNS
62.	Which of the following authentication protocols does not issue a challenge or require third-party verification of the computer requesting authentication? PAP CHAP MS-CHAP EAP Kerberos
63.	You have decided to create two separate VLANs in your office: one for computers on the first floor of your building, and one for computers on the second floor. What type of device will you need for clients on the first floor to communicate with clients on the second floor? Router Switch Bridge Hub Repeater
64.	You have been asked to help improve network performance on a store’s small office network, which relies on two hubs, two access points, and a router to connect its 18 employees to the Internet and other store locations. You decide to determine what type of traffic the network currently handles. In particular, you’re interested in the volume of unnecessary broadcast traffic that might be bogging down shared segments. Which of the following tools will help you identify the percentage of traffic that comprises broadcasts? Butt set OTDR Spectrum analyzer Network monitor Multimeter
65.	What types of files does an incremental backup save? Data that changed prior to the previous incremental backup Data that changed since the previous full or incremental backup All data, regardless of whether it has changed Data that was backed up exactly a week previously Data that users have flagged for backup since the last backup occurred
66.	You are setting up a new Windows Vista client to connect with your LAN, which relies on DHCP. You made certain that the client has the TCP/IP protocol installed and bound to its NIC. Which of the following must you do next to ensure that the client obtains correct TCP/IP information via DHCP? Make certain the client’s computer name and host name are identical. Enter the client’s MAC address in the DHCP server’s ARP table. Make sure the Client for Microsoft Networks service is bound to the client’s NIC. Enter the DHCP server address in the Windows Vista TCP/IP configuration. Nothing; in Windows Vista, the DHCP option is selected by default, and the client will obtain IP addressing information upon connecting to the network.
67.	You are a support technician trying to help a user configure a new graphics program she installed on her laptop. The laptop runs Ubuntu Linux. After some failed attempts at talking her through the process, you decide to remotely take over her workstation and walk her through the process. Which of the following open source software programs would allow you to do this? Remote Desktop RealVNC OpenConnect ICA (Independent Computing Architecture) Client RAS (Remote Access Service)
68.	Which of the following devices separates broadcast domains? Hub Switch Bridge Repeater Router
69.	Which one of the following media is most resistant to EMI? Coaxial cable UTP cable STP cable Fiber-optic cable Infrared waves
70.	In the following figure, if router B suffers a failure, how will nodes 1 through 9 be affected? They will only be unable to access the Internet. They will be unable to access the Internet and either nodes 10 through 14 or 15 through 20. They will be unable to access the Internet, other nodes on the WAN, and other nodes on the LAN. They will be unable to access the Internet and nodes 10 through 20. Their connectivity will not be affected.
71.	Which of the following routing protocols has the poorest convergence time? RIP EIGRP OSPF BGP IGRP
72.	Which of the following ports would be used during a domain name lookup? 22 23 53 110 443
73.	Suppose you have created six subnets on your network, which leases a group of Class C IPv4 addresses. What subnet mask must you specify in your clients’ configurations to adhere to your subnetting scheme? 255.255.255.6 255.255.255.128 255.255.255.192 255.255.255.224 255.255.255.252
74.	Which of the following protocols encapsulates data for transmission over VPNs? CHAP SNMP L2TP SFTP MPLS
75.	You have begun a new job with an ISP, and one of your first tasks is to configure a replacement router for the router that now handles traffic to and from the company’s connection to its NSP (network service provider). Which of the following routing protocols will the router likely use? RIP BGP IS-IS IGRP RIPv2
76.	Which of the following wireless networking standards can reliably transmit data the farthest? Bluetooth 802.11a 802.11b 802.11c 802.11n
77.	How does STP (Spanning Tree Protocol) prevent or stop broadcast storms? It examines the source IP address field in each broadcast packet and temporarily blocks traffic from that address. It enables routers to choose one set of best paths and ensures that alternate paths are used only when the best paths are obstructed. It enables switches to calculate paths that avoid potential loops and artificially blocks the links that would complete a loop. It enables firewalls to keep access lists that name hosts known for high-volume broadcast traffic and block those hosts from transmitting to the network. It helps routers define the boundaries of a broadcast domain.
78.	Which of the following standards describes a security technique, often used on wireless networks, in which a port is prevented from receiving traffic until the transmitter’s credentials are verified by an authentication server? EAPoL SSH SSL Kerberos MS-CHAP
79.	If a Windows Vista workstation is configured to use DHCP but cannot find a DHCP server, it will assign itself an address and subnet mask. Which of the following IPv4 addresses might it assign itself? 129.0.0.1 255.255.255.255 123.45.67.89 169.254.1.120 987.65.432.1
80.	Suppose your Windows Vista workstation’s wireless network adapter is configured to use the 802.11b wireless networking standard. Also, suppose a café you visit has an 802.11g access point. Assuming you have the correct SSID and logon credentials, what will happen when you attempt to associate with the café’s wireless network? Your wireless networking client will be able to see the access point but unable to associate with it. Your wireless networking client will not be able to see the access point. Your wireless networking client will be able to see the access point and attempt to associate with it, but the incompatible frequencies will prevent successful authentication. Your wireless networking client will be able to see the access point and attempt to associate with it, but the incompatible security techniques will prevent successful authentication. Your wireless networking client will be able to see the access point and successfully associate with it.
81.	Routers use IGMP to: Identify nodes belonging to a multicast group Communicate with other routers about the best path between nodes Reserve bandwidth for priority transmissions, ensuring high QoS Filter out potentially harmful packets Predict the expected round-trip time of a packet over a WAN
82.	Which of the following techniques would allow you and eight coworkers to share a single Internet-routable IP address? IPX/SPX DNAT DHCP SNAT LLAT
83.	You work for a large fashion design firm. Because of a recent TV promotion, your company has received national recognition. At the same time, your WAN has received more security threats. To help fend off these threats, you decide to implement an IPS/IDS. Following is a simplified network diagram that represents your private network and its public network connection. Where on this diagram would you place the IPS/IDS device?
84.	A user watching an episode of a popular TV show over the Internet is an example of what type of communication? Unicast Multicast Broadcast Point-to-multipoint Multipoint-to-point
85.	What’s the difference between a rollover cable and a crossover cable? In a rollover cable, only two wire pairs are reversed, while in a crossover cable, all wire pairs are reversed. In a rollover cable, no wires are reversed, while in a crossover cable, all wires are reversed. In a rollover cable, all wires are reversed, while in a crossover cable, only two wire pairs are reversed. In a rollover cable, one wire pair is reversed, while in a crossover cable, three wire pairs are reversed. In a rollover cable, three wire pairs are reversed, while in a crossover cable, no wires are reversed.
86.	If you use RIP on your LAN, what is the maximum number of hops a packet can take between its source and its destination? 3 5 10 15 18
87.	You work for a telephone company that provides Internet service via dial-up and DSL connections. One day you have the chance to work in the field with an older telephone technician. You stop at an intersection and open a pedestal where telephone pairs terminate. Which of the following tools does the technician use to determine whether a customer’s line is obtaining dial tone from the CO? OTDR Network monitor Protocol analyzer Butt set Cable continuity tester
88.	Which of the following QoS techniques enables packet-switched technologies to travel over traditionally circuit-switched connections? ATM SONET MPLS Frame relay Trunking
89.	Every employee in your company receives an e-mail that appears to have been sent from the CEO but wasn’t. The message instructs employees to click on a link to update their personnel profile. In fact, the link takes them to a Web site that appears to be a company-sponsored site but is actually one designed by a hacker to capture personal data, such as Social Security numbers and credit card information, from employees. The hacker is using which of the following techniques? (Choose all that apply.) Denial-of-service attack Phishing Spoofing Flashing Smurf attack
90.	How does a switch know which VLAN a stream of data belongs to? It reads the FCS in each packet’s header. It keeps a table of source and target MAC addresses and their associated VLANs and refers to that table when examining each datagram. It reads a tag added to each frame’s header. It searches for an identifying pattern in the Data field of each frame. The VLAN information is clear from an envelope that encapsulates each packet.
91.	The following graph, which represents traffic activity for an ISP’s client, indicates that the ISP is utilizing what traffic-shaping technique? Traffic policing Caching Load balancing Access list controls Fault tolerance
92.	Your company’s network administrator has told you that you may operate a Web server for employees to access as long as it remains inside the demilitarized zone. What does she mean by this? You may set up a Web server on your home network. You may set up a Web server on the company’s access server, which allows clients from around the globe to connect to your WAN. You may set up a Web server at a hosting facility outside of the company’s LAN or WAN. You may set up a Web server on the company’s private LAN, which is protected by a firewall. You may not set up a Web server on the company’s LAN or WAN.
93.	You are a help desk analyst for a pharmaceutical company whose salespeople travel around the world. One day you receive a call from a sales representative who cannot access the company’s VPN. You identify and record the user’s symptoms in a help desk database. You verify that he is correctly performing the steps required to connect to the VPN, and you establish that nothing else has changed on his laptop. In addition, you attempt to connect to the VPN and cannot. While you are talking with the sales representative, two other employees call and complain that they cannot access the company’s VPN. What is your next step in troubleshooting the problem? Create an action plan and solution and be prepared for all potential effects. Determine whether escalation is necessary. Implement a solution and test the result. Identify the results and effects of the solution. Establish the most probable cause.
94.	If an organization follows structured cabling standards, where would its demarc be located? Entrance facilities MDF IDF Cross-connect facilities Backbone
95.	You are helping to troubleshoot a recurring problem related to obtaining and keeping a DHCP-distributed IP address on a colleague’s Windows Vista workstation. What application would allow you to configure the workstation to tally these errors and send you an e-mail message every time such a problem occurred? Network and Internet Connections System Logger PuTTY System Manager Event Viewer
96.	What type of satellites are typically used for broadband Internet access? Low Earth orbiting Medium Earth orbiting High Earth orbiting Multipath Geosynchronous
97.	In IPv6 addressing, which of the following Format Prefixes indicates that an address belongs to a multicast group? 00FF 1F3E FF02 0001 FEC0
98.	Suppose your WAN contained a segment that relied on the 10GBase-EW standard. Which of the following transmission technologies would it use? SONET Satellite Broadband cable DSL ISDN
99.	To provide some basic security for your small office network, you install software called IP Tables on an old Linux computer. This software examines each incoming datagram. Based on a set of criteria, including source IP address, source and destination ports, and protocols, it blocks or allows traffic. What type of system is this? (Choose all that apply.) Content-filtering firewall Stateful firewall Stateless firewall Packet-filtering firewall Application layer firewall
100.	Ethernet and ATM both specify data link layer framing techniques. How do they differ? Ethernet uses CRC fields to confirm the validity of the frame, while ATM uses no error detection. Ethernet uses variably sized packets, while ATM uses fixed-sized cells. Ethernet uses synchronous transmission, while ATM uses asynchronous transmission. Ethernet uses frame headers, while ATM does not. Ethernet offers no guarantee of timely delivery, while ATM ensures that packets are delivered within 10ms.