思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案
思科认证考试（ＣＣＮＡ）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 is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on it’s 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 "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 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) show 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 Resolution Protocol (RARP) is the process:
a) Where an 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 sending a network broadcast. The destination
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 the destination host responds with it’s IP address.
e)There 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) 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 definition of administrative distance as it pertains to Cisco’s 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 due to it’s 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 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 listen 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 protocols 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 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 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 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 172.16.0.0 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 destination.
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. 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 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 - ATM
B - Bridging
C - Cisco specific
E - Ethernet