ccna interview questions and answers

Part - 13 CCNA Interview Questions and Answers

61 Which fields of an IP packet provide for fragmentation of datagrams to allow differing MTUs in the internet?

A. Identification

B. Flags

C. Frag Offset

D. Type of Service

E. Total Length

Ans A, B & C

62 Which processes does TCP, but not UDP, use?

A. Windowing

B. Acknowledgements

C. Source Port

D. Destination Port

Ans A & B

UDP (User Datagram Protocol) does not use sequence or acknowledgement fields in transmission. UDP is a connectionless and unreliable protocol, since there is no delivery checking mechanism in the UDP data format.

63 What is the UDP datagram format?

A. Source Port - 16 bits, Destination Port - 16 bits, Length - 16 Bits, Checksum - 16 bits, Data

B. Destination Port - 16 bits, Source Port - 16 bits, Length - 16 Bits, Checksum - 16 bits, Data

C. Source Port - 16 bits, Destination Port - 16 bits, Checksum - 16 Bits, Length - 16 bits, Data

D. Source Port - 8 bits, Destination Port - 8 bits, Length -8 Bits, Checksum - 8 bits, Data

Ans A

The UDP format for a segment is as follows: Source Port 16 bits Destination Port 16 bits Length 16 bits Checksum 16 bits Data xx bits

64 What is the function of DDR on Cisco routers?

A. DDR is dial--on-demand routing. It provides a continuous LAN only connection.

B. DDR is dial-on-demand routing. It provides routing for high volume traffic.

C. DDR is dial--on-demand routing. It provides a continuous WAN connection.

D. DDR is dial-on-demand routing. It provides routing for low volume and periodic traffic.

Answer: D

DDR is dial-on-demand routing. It provides routing for low volume and periodic traffic. It initiates a call to a remote site when there is traffic to transmit.

65 What are the two types of access lists that can be configured on a Cisco router?

A. Standard

B. Extended

C. Filtering

D. Packet

Ans: A & B

The access lists are standard and extended. Standard access lists for IP check the source address of packets that could be routed. Extended access lists can check the source and destination packet plus check for specific protocols, port numbers, etc.