UCCN1003 Data Communications and NetworksMay 2010Student ID : ______________________Program : ______________________ (e.g: IA, IB, CN, CS, CT)Lab Instructor : ______________________ (e.g: Mr. Tan, Ms. Wong…)Lab Day & Time : ______________________ (e.g: Wed, 12pm to 1:30pm)Mid-Term Test 01Multiple Choice Questions (Choose all that apply, including none of the above)[35 questions, 2 marks each, Total = 70 marks]1. Which of the following network device(s) can a network engineer use to split the LAN? (Note: split the LAN = increase the number of broadcast domains) A) Hubs B) Repeaters C) Cables D) Managed Switches E) Routers F) PCs G) Bridges H) Access PointsAnswer:2. Referring to the diagram above, which statements are true in this network? (Assuming that both Server0 and Server1 can provide the kind of network services as in Packet Tracer.) A) All the devices in both networks will receive a broadcast send by PC0 B) Only the network interfaces in network 192.168.1.0 will receive a broadcast send by PC0 C) PC3 will be able to process ARP request from PC1. D) PC2 will be able to receive the DHCP service from Server0. E) PC0 will be able to receive FTP service from Server1. F) PC1 will be able to receive DNS service from Server0.Answer:
3. Given the choices below, which address represents a unicast address? (Note: MAC and IP) A) 126.96.36.199 B) 127.0.0.1 C) 0001.C703.4602 D) FFFF.FFFF.FFFF E) 172.31.128.255/18 F) 255.255.255.255 G) 188.8.131.52/29 H) 184.108.40.206/28 I) 192.168.24.59/30 J) 0.240.5.89 K) 220.127.116.11Answer:4. The company LAN shown in the above diagram uses IP network 172.28.4/0 for all the departments. All workstations use 172.28.4.1 as the default gateway address. Network administrators have recently become concerned that excessive broadcasts are slowing network performance. Which change is most likely to reduce broadcast traffic on the company LAN? A) Replace Switch2 with a router B) Increase the number of switches in the network closet of each department. C) Change the router-to-switch connection from Fast Ethernet to Gigabit Ethernet. D) Upgrade the OS of the PCs to a more powerful version E) Implement different subnets for each department F) Configure each NIC and switch port to operate at 100M instead of 10M. G) Replace Switch1 with a repeater. H) Attach a new router to Switch1 as second gateway.Answer:5. Given that 18.104.22.168/26, what is(/are) the valid and usable host address of this subnetwork? A) 22.214.171.124 B) 126.96.36.199 C) 188.8.131.52 D) 184.108.40.206 E) 220.127.116.11 F) 18.104.22.168
G) 222.214.171.124 H) 126.96.36.199Answer:6. You have a Class C network, and you need 25 subnets, and you also wish to have as many addresses available for hosts as possible for each subnet. Which one of the following subnet masks should you use? A) /24 B) /25 C) /26 D) /27 E) /28 F) /29 G) /30Answer:7. Given that you have a class B IP address network range, which of the subnet masks below will allow for 650 usable host addresses per subnet? A) /18 B) /19 C) /20 D) /21 E) /22 F) /23 G) /24Answer:8. Which of the following IP addresses is not unique in the global Internet? A) 188.8.131.52 B) 10.200.45.254 C) 172.20.14.37 D) 184.108.40.206 E) 192.168.142.78 F) 220.127.116.11 G) 18.104.22.168 H) 169.254.200.1 I) 22.214.171.124 J) 126.96.36.199 K) 127.0.0.1Answer:9. Based on the router interfaces IP shown in the above diagram, it is discovered that hosts in the Branch LAN (e.g. PC0) cannot access the Internet. What will fix this problem? A) Change the address of the Branch router LAN interface B) Change the subnet mask of the HG router LAN interface C) Change the address of the HG router LAN interface D) Change the address of the HG router interface to the Internet
E) Change the address of the Branch router serial interface F) Change the subnet mask of the HG router interface to the Internet G) Change the LAN gateway IP of HG router.Answer:10. In which situation would the use of a static route be appropriate? A) To provide access to the Internet for enterprise PCs and printers B) To configure routes to access critical server resources within the enterprise. C) To reach a network which are more than 15 routers away. D) To configure a route from the enterprise to an Internet Service Provider router. E) To configure routes to the local DHCP servers. F) To configure routes when the network administrator need to access the IP protocol. G) To configure routes as backup in case some routers failure.Answer:11. Which of the following will allow telneting from a user to a desired router using TCP/IP? A) Connect a PC’s COM port to the router’s console port using a straight-through cable. B) Connect a PC’s COM port to the router’s console port using a cross-over cable. C) Connect a PC’s COM port to the router’s Ethernet port using a rollover cable. D) Connect a PC’s COM port to the router’s console port using a rollover cable. E) Connect a router serial port to the desired router’s console port using a rollover cable. F) Connect a router serial port to the desired router’s serial port using a serial cable. G) Connect a router Ethernet port to the target router’s Ethernet port using a crossover cable. H) Connect a PC’s Ethernet port to the router’s Ethernet port using a rollover cable. I) Connect a PC’s Ethernet port to the router’s Ethernet port using a crossover cable. J) Connect a PC’s Ethernet port to the router’s Ethernet port using a straight-through cable.Answer:12. How does a hub differ from a switch? A) A switch operates at a lower, more efficient layer of the TCP/IP model. B) A switch tracks MAC address of directly-connected devices. C) A switch does not include any latency into the frame transfer time. D) A switch decreases the number of broadcast. E) A switch has more complex circuitry than the hub F) A switch expands the number of hosts connected to a LAN G) A switch avoids traffic collision as compared to a hub.Answer:13. A Cisco engineer needs to configure a router by connecting a remote computer to the router through the router’s auxiliary port. Which of the following describe the hardware required to make the connection to the router?
A) The auxiliary port must be connected to a modem. B) The auxiliary port must be connected to a repeater. C) The auxiliary port must be connected to an Ethernet LAN. D) The Cisco engineer needs an RJ-45 to DB25 adapter. E) The Cisco engineer needs an Ethernet transceiver. F) The Cisco engineer needs a cross-over cableAnswer:14. The following configuration command was issued on a router. Which of the following statement(s) is/are true regarding this command?Router(config)#ip route 192.168.4.0 255.255.255.252 188.8.131.52 A) This command is used to establish a default route B) This command is used to establish a dynamic route C) This command is used to establish a connection to the Internet Service Provider D) The subnet mask for the source IP address is 255.255.255.252 E) The network 192.168.4.0 is connected to this router F) 184.108.40.206 is one of the IP addresses of this router.Answer:15. For the network 192.168.20.24/29, the router is assigned to the first usable host address, while the second last usable host address goes to your Sales server. Which of the following commands would you key into the IP configuration box of the sales server? A) IP = 192.168.20.14; Mask = 255.255.255.248; Gateway = 192.168.20.9 B) IP = 192.168.20.254; Mask = 255.255.255.248; Gateway = 192.168.20.1 C) IP = 192.168.20.30; Mask = 255.255.255.240; Gateway = 192.168.20.25 D) IP = 192.168.20.30; Mask = 255.255.255.240; Gateway = 192.168.20.17 E) IP = 192.168.20.30; Mask = 255.255.255.240; Gateway = 192.168.20.254 F) IP = 192.168.20.25; Mask = 255.255.255.240; Gateway = 192.168.20.26Answer:16. Which of the following statements are true if a particular router have these two commands? ip route 192.168.1.0 255.255.255.240 10.0.0.1 ip route 0.0.0.0 0.0.0.0 220.127.116.11 A) The router will send all packets out to 18.104.22.168 B) The router will send all unauthorized packets to 22.214.171.124 C) The router will send packets with destination IP of 192.168.1.21 to 126.96.36.199 D) The router will send packets with destination IP of 192.168.10.2 to 10.0.0.1 E) The router will redirect all packets destined to 192.168.1.0/24 to 188.8.131.52 F) The router will send all packets not destined to network 192.168.1.0/24 to 184.108.40.206 G) The router will drop all packets for which the destination network is unknown to router. H) The router will send packets with source IP of 192.168.1.11 to 10.0.0.1
Answer:17. An IP packet (in the form of a frame) that is required to be forwarded arrives on an interface of a router from another router. In order for this router to route and forward this packet, what must that router determine? A) The route age of the next-hop device B) The size of the packet C) The outbound interface of the best path to the destination D) The subnet mask of the source network E) The cost metric of the path of the destination F) The port number of the IP packetAnswer:18. Which of the following commands will prompt you a password if you wanted to access the Cisco router via HyperTerminal? A. Router(config)#line console 0 Router(config-if)#enable password Cisco B. Router(config)#line vty 0 Router(config-line)#enable password Cisco C. Router(config)#line vty 0 Router(config-line)#enable secret Cisco Router(config-line)#login D. Router(config)#line console 0 Router(config-line)#enable secret Cisco Router(config-line)#login E. Router(config)#line console 0 Router(config-line)#secret Cisco Router(config-line)#line F. Router(config)#line vty 0 Router(config-line)#password Cisco Router(config-line)#loginAnswer:19. Which router console commands are used to manage Telnet sessions to other routers? A. Router#resume 4 B. Router#show sessions C. Router#kill connection 1 D. Router#show connection all E. Router#disconnect 3 F. Router#exit session 2Answer:
20. You are experiencing intermittent issues relating to congestion with your network. What are the possible causes of congestion on a LAN? A) A subnet with many hosts and switches B) Full duplex operation C) Too much ARP request being issued D) Video stream multicasting in LAN E) Network segmentation F) Low bandwidth G) Too many gateways in the LANAnswer:21. What components are required to directly connect two PCs so they are able to participate in a simple server-client network? A) Straight-through cable B) Compatible network interface cards C) Networking protocols D) Hub E) Crossover cable F) SwitchAnswer:22. When you power up a Cisco router; in what memory is the start-up configuration normally stored in? A) RAM B) ROM C) tftp server D) Flash E) NVRAMAnswer:23. Which of the following are provided in the Cisco IOS? A) Intrusion Detection B) Application Layer Filtering C) Routing and Switching functions D) Access to router resources E) Some basic server services F) Packet forwardingAnswer:24. In the context of Cisco IOS, what is the definition of a global command? A) A command that can be entered in any configuration mode. B) A command that is set once and affects the entire router. C) A command that supports TCP/IP D) A command that is implemented in any IOS version greater than 10.0 E) A command that is related to the running-configuration of the router F) A command that is related to the interface of the router.Answer:
25. A network engineer in Router0 tries to configure the router to connect to Router1. He tries to create and save an image file of Router0 on the TFTP server but failed. Based on the above diagram, what is the underlying problem? A) The IP address of the TFTP server is not correct B) The default gateway of 192.168.15.48 is not correctly designed C) The subnet mask on Router0 is not correct D) There is an incorrect IP subnet configured on serial line of both router E) There is an incorrect subnet mask of the TFTP server G) The IP of PC0 is not properly setAnswer:26. What should be done before performing a backup an IOS image to a TFTP server? A) Make sure the TFTP server is reachable across the network. B) Check the password authentication for TFTP access. C) Assure that the TFTP server has enough hard disk space for the IOS image. D) Make sure that the TFTP server can store text files. E) Adjust the maximum IP packet size to speed up transfer F) Verify that the TCP connection to TFTP server is ready.Answer:27. Which of the following can be classified as valid network node? A) A router connecting network segments B) A workstation acting as a client to the server C) A switch connecting several network hosts D) A network printer E) A hub connecting several workstations F) A repeater extending the reach of a LANAnswer:28. You have installed a NIC and TCP/IP in a workstation running Windows XP. When the workstation is connected to the hub and restarted, the activity link light on the NIC does not glow. Which of the following is least likely to be the cause of the problem?
A) The Ethernet cable B) Wrong IP address C) A bad port on the hub D) The NIC is not properly slotted in the PC E) DHCP server is not working F) Router is not set properly G) Power supply of the PC H) Windows XP is not properly installedAnswer: DHCP Server29. Refer to the above diagram. You have set up a DHCP server in one segment of your network. When the DHCP server is fully functional, both PC3 and PC4 are not able to get IP addresses automatically from the DHCP server. What would be the solution to the problem? A) Attached another DHCP server to Hub0. B) Replace the Hub0 with a switch. C) Replace the Router0 with a switch. D) Set the IP addresses of PC3 and PC4 to be in the same subnet of the DHCP server. E) Replace the router with a repeater F) Connect a crossover cable between Switch0 and Hub0 G) Replace Switch0 with a hub.Answer:30. Which of the following is a common use of the putty program? A) Checking Network Layer B) Remote administration C) Monitoring Traffic D) TroubleshootingAnswer:31. You are trying to troubleshoot some problems within your local area network. Which of the following router IOS command(s) that is/are helpful to troubleshoot local area network connectivity problems? A) ping B) tracert C) ipconfig D)show ip route E) show interfaces F) nslookup G) show run H) arp -aAnswer:32. A router receives a packet on the interface 172.16.45.66/26. The source IP of the packet is 172.16.45.127/26 and the destination is 172.16.46.191/26. How will the router handle the packet?
A) The destination is a host on another subnet, so the router will not forward the packet B) The destination is a host on the same subnet, so the router will forward the packet C The destination is a network address, so the router will forward the packet. D) The destination is a broadcast address, so the router will not forward the packet.Answer:33. When selecting a Network Interface Card (NIC), which of the following factors is required to be considered? A) The type of application used on the network B) The type of system bus used by the computers C) The type of memory installed in each computer D) The type of media used in the network topology E) The type of protocols used in the network F) The bandwidth requiredAnswer:34. Refer to the above diagram, a network engineer on PC0 uses Telnet to log in to the CLI of Router0. The engineer wishes to discover the information about active workstations on LAN attached to Router1, including their IP and MAC addresses. Which command(s) will provide this information A) show starup-config B) show hosts C) show arp D) show interfaces E) show ip arp F) show ip routeAnswer:35. Which of the following correctly describe a MAC address? A) It is a globally unique address B) It is a logical address C) It is controlled by ICANN D) It is provided by the manufacturer of the NIC E) It is a private address F) It can be easily associated to a geo-locationAnswer: