Networking basics interview questions

6.
Which WLAN IEEE specification allows up to 54Mbps at 2.4GHz?
A. A
B. B
C. G
D. N
Answer: Option C

Explanation:

IEEE 802.11B is 2.4GHz, but with a maximum of only 11Mbps. IEEE 802.11G is in the 2.4GHz range, with a top speed of 54Mbps.
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7.
Which of the following is the valid host range for the subnet on which the IP address 192.168.168.188 255.255.255.192 resides?
A. 192.168.168.129-190
B. 192.168.168.129-191
C. 192.168.168.128-190
D. 192.168.168.128-192
Answer: Option A

Explanation:

256 – 192 = 64. 64 + 64 = 128. 128 + 64 = 192. The subnet is 128, the broadcast address is 191, and the valid host range is the numbers in between, or 129-190.
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8.
To back up an IOS, what command will you use?
A. backup IOS disk
B. copy ios tftp
C. copy tftp flash
D. copy flash tftp
Answer: Option D

Explanation:

The command copy flash tftp will prompt you to back up an existing IOS in flash to a TFTP host.
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9.
What protocol does PPP use to identify the Network layer protocol?
A. NCP
B. ISDN
C. HDLC
D. LCP
Answer: Option A

Explanation:

Network Control Protocol is used to help identify the Network layer protocol used in the packet.
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10.
Which of the following commands will allow you to set your Telnet password on a Cisco router?
A. line telnet 0 4
B. line aux 0 4
C. line vty 0 4
D. line con 0
Answer: Option C

Explanation:

The command line vty 0 4 places you in a prompt that will allow you to set or change your Telnet password.