1、思科认证考试CCNA考试模拟题集锦171题及答案思科认证考试（）考试模拟题集锦(1-71题)及答案19及答案1. OxNx During a TFTP transfer using Cisco Routers what is the numeric value, in decimal, of the destination port field of the User Datagram Protocol (UDP) header? a) 96 b) 47 c) a random number above 1024 d) 69 e) none of the above 2. CxNx What
2、is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on its Ethernet interfaces? a) SNAP b) ARPA c) NOVELL-ETHER d) DARPA e) Ethernet_802.3 3. CxNx What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the ro
3、uter(config-if)# prompt? a) ip address 1.1.1.1 255.255.255.0 b) ip address 1.1.1.1 c) ip 1.1.1.1 d) ip 1.1.1.1 255.255.255.0 e) none of the above 4. CxNx Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply) a) show ip route b) show ip address c) s
4、how ip interface d) show interface e) display ip addresses 5. CxNx Which of the following commands will display the contents of the ARP cache of your Cisco router? a) show ip arp cache b) show ip route c) show ip arp d) show arp e) there is no way to display the ARP cache 6. CxNx Reverse Address Res
5、olution Protocol (RARP) is the process: a) Where an IP host resolves its IP address by broadcasting its MAC address to the network and a BOOTP server assigns it an IP address. b) Where an IP host resolves its MAC address by broadcasting to the local network its IP address. c) Where an IP host tries
6、to resolve the MAC address of a destination by sending a network broadcast. The destination responds to the broadcast with its MAC address. d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and the destination host responds with its IP address. e)There
7、 is no such process. 7. OxNx Which of the following applications requires the connection-oriented layer four protocol, TCP? (Choose all that apply) a) Telnet b) FTP c) TFTP d) SNMP e) none of the above 8. RxNx Which of the following are link state Routing Protocols. (Choose all that apply.) a) IP b)
8、 OSPF c) RIP d) EIGRP e) IS-IS 9. CxNx Of the following commands, identify the correct one for clearing the IP arp table in memory of the router. a) clear ip arp-cache b) clear ip arp-table c) clear arp-cache d) clear arp-table e) clear arp-ram 10. CxNx Which of the following explains the correct de
9、finition of administrative distance as it pertains to Ciscos IOS? a) The 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
10、due to its lack of administrative experience. d) The process where a router 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. e) The process where a router
11、 will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the highest administrative distance will take priority. 11. ExNx Collisions occur when a) multiple packets are placed on a serial link b) multiple stations lis
12、ten for traffic and transmit at the same time c) when multiple tokens are on a ring simultaneously d) beaconing process takes place 12. RINx How many subnets are possible with a Class C address and a subnet mask of 255.255.255.252? a) 32 b) 30 c) 60 d) 62 e) 4 13. RxNx What commands will list all pr
13、otocols that are currently being routed? (Choose all that apply.) a) show ip protocol b) show protocol c) show run d) show start e) All of the above 14. 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
14、always be a permit statement. c) Every access-list will implicitly deny all traffic. d) Access-lists are processed top down. e) All of the above. 15. xxNx If the access-group command is configured on an interface and there is no access-list created which of the following is most correct? a) An error
15、 message will appear. b) The command will be executed and deny all traffic out. c) The command will be executed 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
16、of the command? access-list 101 permit tcp any 172.16.0.0 0.0.255.255 established a) telnet sessions will be permitted regardless of the source address b) telnet sessions will be denied regardless of the source address c) telnet sessions will be denied if initiated from any address other than 172.16
17、.0.0 network d) telnet sessions will be permitted to the 172.16.0.0 network only e) telnet sessions will be denied to the 172.16.0.0 network only 17. xxNx Which is generally true of the location of access-lists? (Choose all that apply.) a) Standard lists will most likely be placed close to the desti
18、nation. b) Standard lists will most likely be placed close to the source. c) Extended lists will most likely be placed close to the destination. d) Extended lists will most likely be placed close to the source. e) It does not matter. 18. RxNx Which of the following is most correct? a) IP is to TCP.
19、as IPX is to SPX. b) RTMP is to Appletalk as IP RIP is to IP. c) NLSP is to IPX as OSPF is to IP. d) a is true. e) b is true. f) a & b are true. g) c is true. h) b & c are true. i) a, b and c are true. 19. ExNx If Host A sends a packet to Host B over ethernet and Host B is not active: a) The packet
20、will time out. b) The packet will be removed by Host A. c) The NVRAM of Host B will remove the packet. d) The packet will die when it reaches the terminator. e) The packet will be removed by the token monitor. Coding Key and Information The first character represents the category of question. A - AT
21、M B - Bridging C - Cisco specific E - Ethernet F - Frame relay H - HDLC I - FDDI N - ISDN O - OSI model P - PPP R - Routing S - Switching T - Token ring X - X.25 x - Not applicable The second character represents protocol. A - Appletalk B - Banyan Vines D - Decnet I - IP L - Dial on Demand N - NLSP
22、O - OSPF X - IPX x - Not Applicable The third character represents the certification that the question will help you prepare for. N - CCNA Exam #640-407 P - CCNP Advanced Cisco Router Configuration (ACRC) Exam 640-403 Cisco LAN Switch Configuration (CLSC) Exam #640-404 Cisco Monitoring and Troublesh
23、ooting Dial-up Services Exam #640-405 Cisco Internetworking Troubleshooting ( CIT) Exam #640-406D - CCDA & CCDP Cisco Design Specialist Exam #9E0-004 Cisco Internetwork Design#640-025We will reserve the fourth character for future use. As an example, when you come across a question coded BXDx, it si
24、gnifies a question that will help you gain the CCDA or CCDP certification. CCNA试题1-19答案1. OxNx During a TFTP transfer using Cisco Routers what is the numeric value, in decimal, of the destination port field of the User Datagram Protocol (UDP) header? a) 96 b) 47 c) a random number above 1024 d) 69 e
25、) none of the above Answer d) 69 Here is a sampling of other port numbers and the application they are associated with. The first 8 of these protocols are automatically forwarded through the router by using the helper-address command Trivial File Transfer (TFTP) (port 69) Domain Name System (port 53
26、) IEN-116 Name Server (port 42) Time service (port 37) NetBIOS Name Server (port 137) NetBIOS Datagram Server (port 138) Boot Protocol (BootP) client and server datagrams (port 67) TACACS service (port 49) Simple Mail Transfer Protocol (25) File Transfer Protocol (21) Simple Network Management Proto
27、col (161) 2. CxNx What is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on its Ethernet interfaces? a) SNAP b) ARPA c) NOVELL-ETHER d) DARPA e) Ethernet_802.3 Answer b) ARPA SNAP is the default encapsulation for a token ring interface NOVELL-ETHER is the defa
28、ult encapsulation for a ipx interface. 3. CxNx What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the router(config-if)# prompt? a) ip address 1.1.1.1 255.255.255.0 b) ip address 1.1.1.1 c) ip 1.1.1.1 d) ip 1.1.1.1 255.255.255.0 e) none of th
29、e above Answer a) ip address 1.1.1.1 255.255.255.0 If you are not in the configuration mode, the ip address can be set by using the setup mode. Configuring interface Ethernet0/0: Is this interface in use? yes: Configure IP on this interface? yes: IP address for this interface 10.10.10.1: 10.10.10.1
30、Number of bits in subnet field 16: 16 Class A network is 10.0.0.0, 16 subnet bits; mask is /24 Take note when using the setup mode the mask is configured using the number of subnet bits. 4. CxNx Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply)
31、 a) show ip route b) show ip address c) show ip interface d) show interface e) display ip addresses Answer c) show ip interface d) show interface Examples of each of these commands are shown below: Router_A#sh int e0/0Ethernet0/0 is up, line protocol is upHardware is AmdP2, address is 0010.7b15.bd41(bia 0010.7b15.bd41)Internet address is 10.10.10.1/24MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255Encapsulation ARPA, loopback not set,
