cisco网络学院第二学期习题

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Question 1: \r\nIf a new LAN is added to an internetwork, which command would add the network to the routing table?\r\nA.   Router (config)> ip route 2.0.0.0 255.0.0.0 via 1.0.0.2 \r\nB.   Router (config)# ip route 2.0.0.0 255.0.0.0 1.0.0.2 \r\nC.   Router (config)# ip route 2.0.0.0 via 1.0.0.2 \r\nD.   Router (config)# ip route 2.0.0.0 1.0.0.2 using 255.0.0.0 \r\n\r\nQuestion 2: \r\nIf you are unsure of the options (subcommands) for a command, which keystroke(s) should you try on the user interface of a Cisco router?\r\nA.   Help \r\nB.    ? \r\nC.   CTRL-H \r\nD.   CTRL-P \r\n\r\nQuestion 3: \r\nHow are link-state routing updates triggered?\r\nA.   By timers \r\nB.   By topology changes \r\nC.   By protocol changes \r\nD.   By changing the NIC \r\n\r\nQuestion 4: \r\nWhich of the following are stored in NVRAM?\r\nA.   Routing Tables \r\nB.   Configuration Files \r\nC.   IOS Image \r\nD.   Power on diagnostics \r\n\r\nQuestion 5: \r\nWhat is the function of the erase startup-config command?\r\nA.   It deletes the current IOS from NVRAM \r\nB.   It deletes the configuration file in RAM \r\nC.   It deletes the configuration file in NVRAM \r\nD.   It deletes the bootstrap image from Flash memory \r\n\r\nQuestion 6: \r\nWhat is a WAN?\r\nA.   A network that connects users across a large geographic area \r\nB.   A network that connects devices in a workgroup setting \r\nC.   A network that connects business departments in a building \r\nD.   A network that connects physically adjacent devices \r\n\r\nQuestion 7: \r\nWhat is the function of ARP?\r\nA.   It is used to map a known MAC address to an unknown IP address. \r\nB.   It is used to develop a cached Layer 4 address resource table. \r\nC.   It is used to map a known IP address to an unknown MAC address. \r\nD.   It sends a broadcast message looking for the router IP address. \r\n\r\nQuestion 8: \r\nWhat provides sequencing of segments with a forward reference acknowledgment, numbers datagrams before transmission, and reassembles the segments into a complete message?\r\nA.   Simple UDP acknowledgment \r\nB.   Expectational acknowledgments \r\nC.   TCP sequence and acknowledgment numbers \r\nD.   Header checksums and data protocol checksums \r\n\r\nQuestion 9: \r\nWhich protocol can find the MAC address of a computer given its IP address?\r\nA.   RARP \r\nB.   DHCP \r\nC.   ARP \r\nD.   Proxy RARP \r\n\r\nQuestion 10: \r\nAt which OSI Layer would an incorrect encapsulation type on a serial interface be classified?\r\nA.   Layer 4 \r\nB.   Layer 3 \r\nC.   Layer 2 \r\nD.   Layer 1 \r\n\r\nQuestion 11: \r\nWhich step should be performed before copying software between the TFTP host and Flash memory?\r\nA.   Use the ping command to check connectivity to the server \r\nB.   Check that you can see and write into RAM memory \r\nC.   Verify that there is sufficient room in RAM to accommodate the IOS \r\nD.   Check the configuration file name and location on the network server \r\n\r\nQuestion 12: \r\nWhat is the function of the reload command?\r\nA.   It reboots the router \r\nB.   It saves the new IOS to Flash memory \r\nC.   It loads a new configuration file in NVRAM \r\nD.   It loads a configuration file from a TFTP server \r\n\r\nQuestion 13: \r\nWhat is the data-link destination address of a broadcast message?\r\nA.   111.111.111.111 \r\nB.   255.255.255.255 \r\nC.   AAAA.AAAA.AAAA \r\nD.   FFFF.FFFF.FFFF \r\n\r\nQuestion 14: \r\nWhen working with Cisco IOS, at which level of access are users able to view router status but are unable to change router configuration?\r\nA.   User mode \r\nB.   Enable mode \r\nC.   Privileged mode \r\nD.   Global configuration mode \r\n\r\nQuestion 15: \r\nYou want to create a message to let people know a little something about the network or router when they log on - what command enables you to do this?\r\nA.   banner msg \r\nB.   banner motd \r\nC.   daily msg \r\nD.   daily motd \r\n\r\nQuestion 16: \r\nWhich metric is used in RIP?\r\nA.   Bandwidth \r\nB.   Delay \r\nC.   Hop count \r\nD.   Traffic load \r\n\r\nQuestion 17: \r\nWhich metrics are commonly used by routers to evaluate a path?\r\nA.   EMI load, SDLC connections, deterioration rate \r\nB.   Bandwidth, load, reliability \r\nC.   Distance, hub count, SN ratio \r\nD.   Signal count, loss ratio, noise \r\n\r\nQuestion 18: \r\nHow often are RIP updates broadcast?\r\nA.   Every 15 seconds \r\nB.   Every 30 seconds \r\nC.   Every 60 seconds \r\nD.   Every 90 seconds \r\n\r\nQuestion 19: \r\nWhich command is used to tell the router to boot from ROM?\r\nA.   Router# boot system rom \r\nB.   Router# boot system rom IOS_filename \r\nC.   Router(config)# boot system rom \r\nD.   Router(config)# boot system rom IOS_filename \r\n\r\nQuestion 20: \r\nWhich routing protocol maintains a complex database of topology information and uses link-state advertisements (LSAs)?\r\nA.   RIP \r\nB.   IGRP \r\nC.   OSPF \r\nD.   EIGRP \r\n\r\n\r\nQuestion 31: \r\nIf a Class B network is subnetted with a mask of 255.255.240.0, how many useable subnets are created?\r\nA.   2 \r\nB.   6 \r\nC.   14 \r\nD.   30 \r\n\r\nQuestion 32: \r\nWhat best describes the difference between a routed protocol versus a routing protocol?\r\nA.   Routed protocols are used between routers to maintain tables while routing protocols are used to carry user data. \r\nB.   Routed protocols use distance vector algorithms while routing protocols use link-state algorithms. \r\nC.   Routed protocols are used to carry user data while routing protocols maintain tables. \r\nD.   Routed protocols use dynamic addressing while routing protocols use static addressing. \r\n\r\nQuestion 33: \r\nWhich best describes convergence?\r\nA.   When messages simultaneously reach a router and a collision occurs \r\nB.   When several routers simultaneously route packets along the same path \r\nC.   When all routers in an internetwork have the same knowledge of the structure and topology of the internetwork \r\nD.   When several messages are being sent to the same destination \r\n\r\nQuestion 34: \r\nWhere is the next place a router looks if it cannot find the IOS image in flash?\r\nA.   RAM \r\nB.   ROM \r\nC.   TFTP \r\nD.   NVRAM \r\n\r\nQuestion 35: \r\nIf you want to turn off the name-to-address translation in the router, which command would you use?\r\nA.   no ip host \r\nB.   no ip address \r\nC.   no ip name-search \r\nD.   no ip domain-lookup \r\n\r\nQuestion 36: \r\nWhich command should display RIP routing updates as they are sent and received?\r\nA.   Router# show ip rip \r\nB.   Router# debug ip protocols \r\nC.   Router# debug ip rip \r\nD.   Router# show ip rip update

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Question 37: \r\nWhich Cisco IOS command is used to enter privileged mode?\r\nA.   admin \r\nB.   root \r\nC.   enable \r\nD.   privileged \r\n\r\nQuestion 38: \r\nWhich command is used to backup the active configuration file from a router to a network server?\r\nA.   copy tftp startup-config \r\nB.   copy running-config tftp \r\nC.   copy tftp flash \r\nD.   copy NVRAM tftp \r\n\r\nQuestion 39: \r\nWhat will happen if routers have different sets of LSAs?\r\nA.   A check sum procedure is initiated and faulty routing tables repaired. \r\nB.   Routes become unreachable because routers disagree about a link. \r\nC.   A comparison is forced and subsequent convergence on a single routing table occurs. \r\nD.   A broadcast message is sent with the master copy of the routing table to all routers. \r\n\r\nQuestion 40: \r\nWhich Cisco IOS command displays routing table entries?\r\nA.   ping \r\nB.   trace \r\nC.   show ip route \r\nD.   show interface \r\n\r\n\r\nQuestion 41: \r\nSomeone got into a router configuration file and changed the password to access privileged mode. Which mode on the router enables you to recover passwords?\r\nA.   SETUP \r\nB.   RXBOOT \r\nC.   Privileged EXEC \r\nD.   Global configuration \r\n\r\nQuestion 42: \r\nWhy is a static route the preferred method for reaching stub networks?\r\nA.   static routing requires less overhead \r\nB.   static routing requires more overhead on the network \r\nC.   this allows routers to adjust to changes in the network \r\nD.   the routes are learned automatically \r\n\r\nQuestion 43: \r\nWhich Cisco IOS command shows the configuration file stored in NVRAM?\r\nA.   show version \r\nB.   show running-config \r\nC.   show startup-config \r\nD.   show interfaces \r\n\r\nQuestion 44: \r\nIf a router has a serial interface S0, with IP address 107.85.20.2, using a subnet mask of 255.255.255.240, what is the broadcast address used for hosts on this subnet?\r\nA.   107.85.20.15 \r\nB.   107.85.20.255 \r\nC.   107.85.255.255 \r\nD.   107.255.255.255 \r\n\r\nQuestion 45: \r\nWhich is an example of a data circuit terminating equipment (DCE)?\r\nA.   Modem \r\nB.   Computer \r\nC.   Router \r\nD.   Multiplexer \r\n\r\nQuestion 46: \r\nAt which Layer of the OSI model would you classify the loss of network connectivity due to a loose patch cable?\r\nA.   Layer 7 \r\nB.   Layer 5 \r\nC.   Layer 3 \r\nD.   Layer 1 \r\n\r\nQuestion 47: \r\nWhich describes Layer 3 path determination in the OSI model?\r\nA.   enables switches to find the best path to a host \r\nB.   enables a switch to choose the next hop \r\nC.   determines how a packet is forwarded on the same subnetwork \r\nD.   enables a router to choose the next hop \r\n\r\nQuestion 48: \r\nWhich keys are pressed in the escape sequence to terminate the initial configuration while in setup mode?\r\nA.   ESC \r\nB.   CTRL-C \r\nC.   CTRL-ESC \r\nD.   CTRL-SHIFT-6 , X \r\n\r\nQuestion 49: \r\nWhich command is used to configure a routing protocol?\r\nA.   Router# rip network 192.11.10.0 \r\nB.   Router(config)# router rip \r\nC.   Router(config)# routing rip \r\nD.   Router(config)# routing protocol rip \r\n\r\nQuestion 50: \r\nWhich port is used to initially configure a router?\r\nA.   Auxiliary \r\nB.   Console \r\nC.   Serial \r\nD.   BRI \r\n\r\nQuestion 51: \r\nWhich technique controls the amount of unacknowledged data in transit at any one time and helps enable TCP reliability?\r\nA.   Windowing \r\nB.   Broadcasting \r\nC.   Error recovery \r\nD.   Collision avoidance \r\n\r\nQuestion 52: \r\nAt which Layer of the OSI model would flow control problems exist?\r\nA.   Application \r\nB.   Presentation \r\nC.   Session \r\nD.   Transport \r\n\r\nQuestion 53: \r\nWhich command can be used to check the boot field setting?\r\nA.   Router# show version \r\nB.   Router# show register \r\nC.   Router# show running-config \r\nD.   Router# show startup-config \r\n\r\nQuestion 54: \r\nWhat is the purpose of exterior routing protocols?\r\nA.   To transmit between nodes on a network \r\nB.   To deliver information within a single autonomous system \r\nC.   To communicate between autonomous systems \r\nD.   To set up a compatibility infrastructure between networks \r\n\r\nQuestion 55: \r\nWhy are hold-down timers useful?\r\nA.   They help prevent a router from immediately using an alternate route that includes the failed route \r\nB.   They force all routers in a segment to synchronize switching operations \r\nC.   They reduce the amount of network traffic during high traffic periods \r\nD.   They provide a mechanism for bypassing failed sections of the network \r\n\r\nQuestion 56: \r\nWhich is a network layer protocol that can be routed?\r\nA.   IP \r\nB.   ISP \r\nC.   NetBEUI \r\nD.   ARP \r\n\r\nQuestion 57: \r\nWhich router component provides working memory for configuration files and routing tables?\r\nA.   RAM \r\nB.   ROM \r\nC.   Flash \r\nD.   NVRAM \r\n\r\nQuestion 58: \r\nHow many bits are in the network and subnet portion of a class B network with a subnet mask of 255.255.240.0?\r\nA.   18 \r\nB.   19 \r\nC.   20 \r\nD.   21 \r\n\r\nQuestion 59: \r\nWhat correctly describes the five conversion steps of data encapsulation?\r\nA.   Data-segments-packets-frames-bits \r\nB.   Data-packets-segments-frames-bits \r\nC.   Data-frames-segments-packets-bits \r\nD.   Data-segments-frames-packets-bits