CN |Gate-2013| Previous Year Questions| Set-8

Set-15 GATE-2006 CN

CN |Gate-2013| Computer Networks

  1. The transport layer protocols used for real time multimedia, file transfer, DNS and email, respectively are: [GATE – 2013]

a. TCP, UDP, UDP and TCP
b. UDP, TCP, TCP and UDP
c. UDP, TCP, UDP and TCP
d. TCP, UDP, TCP and UDP

Answer : c)


  1. Using public key cryptography, X adds a digital signature  to message M, encrypts <M, σ>, and sends it to Y, where it is decrypted. Which one of the following sequences of keys is used for the operations? [GATE – 2013]

a. Encryption: X’s private key followed by Y’s private key; Decryption: X’s public key followed by Y’s public key
b. Encryption: X’s private key followed by Y’s public key; Decryption: X’s public key followed by Y’s private key
c. Encryption: X’s public key followed by Y’s private key; Decryption: Y’s public key followed by X’s private key
d. Encryption: X’s private key followed by Y’s public key; Decryption: Y’s private key followed by X’s public key

Answer : d)


  1. Assume that source S and destination D are connected through to intermediate routers labeled R. Determine how many times each packet has to visit the network layer and the data link layer during a transmission from S to D [GATE – 2013]

a. Network layer – 4 times and Data link layer – 4 times
b. Network layer – 4 times and Data link layer – 3 times
c. Network layer – 4 times and Data link layer – 6 times
d. Network layer – 2 times and Data link layer – 6 times

Answer : c)


  1. Determine the maximum length of the cable (in km) for transmitting data at a rate of 500 Mbps in an Ethernet LAN with frames of size 10,000 bits. Assume the signal speed in the cable to be 2,00,000 km/s. [GATE – 2013]

a. 1
b. 2
c. 2.5
d. 5

Answer : b)


  1. In an IPv4 datagram, the M bit is 0, the value of HLEN is 10, the value of total length is 400 and the fragment offset value is 300. The position of the datagram, the sequence numbers of the first and the last bytes of the payload, respectively are [GATE – 2013]

a. Last fragment, 2400 and 2789
b. First fragment, 2400 and 2759
c. Last fragment, 2400 and 2759
d. Middle fragment, 300 and 689

Answer : c)
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