Computer Networks
Q41. How many 8-bit characters can be transmitted per second over a 9600 baud serial communication link using the asynchronous mode of transmission with one start bit, eight data bits, and one parity bit? (Gate 2004)
- 600
- 800
- 876
- 1200
Ans. (2) 800
Q42. Which of the following is NOT true with respect to a transparent bridge and a router? (Gate 2004)
- Both bridge and router selectively forward data packets
- A bridge uses IP addresses while a router uses MAC addresses
- A bridge builds up its routing table by inspecting incoming packets
- A router can connect between a LAN and a WAN.
Ans. (2) A bridge uses IP addresses while a router uses MAC addresses
Q43. Choose the best matching Group 1 and Group 2. (Gate 2004)
| Group-1 | Group-2 |
|---|---|
| P. Data link layer | 1. Ensures reliable transport of data over a physical point-to-point link |
| Q. Network layer | 2. Encodes/ decodes data for physical transmission |
| R. Transport layer | 3. Allowed-to-end communication between two processes |
| 4. Routes data from one network node to the next |
- P-1, Q-4, R-3
- P-2, Q-4, R-1
- P-2, Q-3, R-1
- P-1, Q-3, R-2
Ans. (1) P-1, Q-4, R-3
Q44. Host A is sending data to host B over a full duplex link. A and B are using the sliding window protocol for flow control. The send and receive window sizes are 5 packets each. Data packets (sent only from A to B) are all 1000 bytes long and the transmission time for such a packet is 50 μs. Acknowledgment packets (sent only from B to A), are very small and require negligible transmission time. The propagation delay over the link is 200 μs. What is the maximum achievable throughput in this communication? (Gate 2003)
- 7.69 × 106 bps
- 11.11 × 106 bps
- 12.33 × 106 bps
- 15.00 × 106 bps
Ans. (2) 11.11 × 106 bps
Q45. A 2 km long broadcast LAN has 107 bps bandwidth and uses CSMA/CD. The signal travels along the wire at 2 108 # m/s. What is the minimum packet size that can be used on this network? (Gate 2003)
- 50 bytes
- 100 bytes
- 200 bytes
- None of the above
Ans. (4)None of the above
Q46. The subnet mask for a particular network is 255.255.31.0 Which of the following pairs of IP addresses could belong to this network? (Gate 2003)
- 172.57.88.62 and 172.56.87.23.2
- 10.35.28.2 and 10.35.29.4
- 191.203.31.87 and 191.234.31.88
- 128.8.129.43 and 128.8.161.55
Ans. (4) 128.8.129.43 and 128.8.161.55
Q47. Which of the following functionalities must be implemented by a transport protocol over and above the network protocol? (Gate 2003)
- Recovery from packet losses
- Detection of duplicate packets
- Packet delivery in the correct order
- End-to-end connectivity
Ans. (4) End to end connectivity
Q48. Which of the following assertions is false about the Internet Protocol (IP)? (Gate 2003)
- It is possible for a computer to have multiple IP addresses
- IP packets from the same source to the same destination can take different routes in the network
- IP ensures that a packet is forwarded if it is unable to reach its destination within a given number of hopes
- The packet source cannot set the route of outgoing packets; the route is determined only by the routing tables in the routers on the way.
Ans. (4) The packet source cannot set the route of outgoing packets; the route is determined only by the routing tables in the routers on the way.
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