思科认证考试（ＣＣＮＡ）考试模拟题０１—１９及答案

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) 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)
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 Protocol (161)

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

Answer
b) ARPA

SNAP is the default encapsulation for a token ring interface NOVELL-ETHER is the default 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 the 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
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)

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