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1、思科认证考试(C C N A)考试模拟题集锦(1-71题)及答案19及答案1. OxNx During a TFTP transferusing Cisco Routers what is the numeric value, in decimal, of the destinationport field of the User Datagram Protocol (UDP) header? a) 96b) 47c) a random number above 1024d) 69e) none of the above2. CxNx What is the standard encapsul
2、ation method used by Cisco routers for the Internet Protocol (IP) onit s Ethernet interfaces?a) SNAPb) ARPAc) NOVELL-ETHERd) DARPAe) Ethernet_802.33. CxNx What will be the correct command on a Cisco router to set the IP address of an interface assumingyou are at the router(config-if)# prompt?a) ip a
3、ddress 1.1.1.1 255.255.255.0b) ip address 1.1.1.1c) ip 1.1.1.1d) ip 1.1.1.1 255.255.255.0e) none of the above4. CxNx Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all thatapply)a) show ip routeb) show ip addressc) show ip interfaced) show interfacee) displ
4、ay ip addresses5. CxNx Which of the following commands will display the contents of the ARP cache of your Cisco router?a) show ip arp cacheb) show ip routec) show ip arpd) show arpe) there is no way to display the ARP cache6. CxNx Reverse Address Resolution Protocol (RARP) is the process:a) Where an
5、 I P host resolves it s IP address by broadcasting it s MAC address to the network and a BOOTP server assigns it an IP address.b) Where an IP host resolves it s MAC address by broadcasting to the local network it s IP address.c) Where an IP host tries to resolve the MAC address of a destination by s
6、ending a network broadcast. Thedestination responds to the broadcast with it s MAC address.d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and thedestination host responds with it s IP address.e)There is no such process.7. OxNx Which of the following
7、 applications requires the connection-oriented layer four protocol, TCP?(Choose all that apply)a) Telnetb) FTPc) TFTPd) SNMPe) none of the above8. RxNx Which of the following are link state Routing Protocols.(Choose all that apply.)a) IPb) OSPFc) RIPd) EIGRPe) IS-IS9. CxNx Of the following commands,
8、 identify the correct one for clearing the IP arp table in memory of the router.a) clear ip arp-cacheb) clear ip arp-tablec) clear arp-cached) clear arp-tablee) clear arp-ram10. CxNx Which of the following explains the correct definition of administrative distance as it pertainsto Cisco s IOS?a) The
9、 process by which routers select an administrator for an autonomous system.b) The process where a router will select the best path to a destination network.c) The process where a router will distance itself from other routers due to it s lack of administrativeexperience.d) The process where a router
10、 will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.takee) The process where a router will prioritize routing protocols so that in the event two routing prot
11、ocolshave conflicting next hop addresses, the routing protocol with the highest administrativedistance willpriority.11. ExNx Collisions occur whena) multiple packets are placed on a serial linkb) multiple stations listen for traffic and transmit at the same timec) when multiple tokens are on a ring
12、simultaneouslyd) beaconing process takes place12. RINx How many subnets are possible with a Class C address and a subnet mask of 255.255.255.252?a) 32b) 30c) 60d) 62e) 413. RxNx What commands will list all protocols that are currently being routed? (Choose all that apply.)a) show ip protocolb) show
13、protocolc) show rund) show starte) All of the above14. xxNx Which of the following are true of access lists?a) Access list should have at least one permit statement.b) The last configured line should always be a permit statement.c) Every access-list will implicitly deny all traffic.d) Access-lists a
14、re processed top down.e) All of the above.15. xxNx If the access-group commandis configured on an interface and there is no access-list created which of the following is most correct?a) An error message will appear.b) The command will be executed and deny all traffic out.c) The command will be execu
15、ted and permit all traffic out.d) The command will be executed and permit all traffic in and out.e) The command will be executed and deny all traffic in and out.16. xxNx What is the result of the command?access-list 101 permit tcp any 172.16.0.0 0.0.255.255 establisheda) telnet sessions will be permitted regardless of the source addressb) telnet sessions will be denied regardless of the source addressc) telnet sessions will be denied if initiated from any address other than 172.16.0.0 networkd) telnet sessions will be per
