Routing
September 5, 2024Routing
September 5, 2024Routing
| Question 16 |
Which of the following routing technique / techniques is / are used in distributed systems ?
(a) Fixed Routing
(b) Virtual Routing
(c) Dynamic Routing
(a) Fixed Routing
(b) Virtual Routing
(c) Dynamic Routing
| (a) only | |
| (a) and (b) only | |
| (c) only | |
| All (a), (b), (C) |
Question 16 Explanation:
Distributed systems are using fixed routing only.
Fixed routing: A path from A to B is specified in advance; path changes only if a hardware failure disables it.
1. Since the shortest path is usually chosen, communication costs are minimized.
2. Fixed routing cannot adapt to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Virtual routing: A path from A to B is fixed for the duration of one session.
1. Different sessions involving messages from A to B may have different paths
2. Partial remedy to adapting to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Dynamic routing: The path used to send a message form site A to site B is chosen only when a message is sent
1. Usually a site sends a message to another site on the link least used at that particular time
2. Adapts to load changes by avoiding routing messages on heavily used path
3. Messages may arrive out of order; This problem can be remedied by appending a sequence number to each message
4. Most complex to set up
Fixed routing: A path from A to B is specified in advance; path changes only if a hardware failure disables it.
1. Since the shortest path is usually chosen, communication costs are minimized.
2. Fixed routing cannot adapt to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Virtual routing: A path from A to B is fixed for the duration of one session.
1. Different sessions involving messages from A to B may have different paths
2. Partial remedy to adapting to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Dynamic routing: The path used to send a message form site A to site B is chosen only when a message is sent
1. Usually a site sends a message to another site on the link least used at that particular time
2. Adapts to load changes by avoiding routing messages on heavily used path
3. Messages may arrive out of order; This problem can be remedied by appending a sequence number to each message
4. Most complex to set up
Correct Answer: A
Question 16 Explanation:
Distributed systems are using fixed routing only.
Fixed routing: A path from A to B is specified in advance; path changes only if a hardware failure disables it.
1. Since the shortest path is usually chosen, communication costs are minimized.
2. Fixed routing cannot adapt to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Virtual routing: A path from A to B is fixed for the duration of one session.
1. Different sessions involving messages from A to B may have different paths
2. Partial remedy to adapting to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Dynamic routing: The path used to send a message form site A to site B is chosen only when a message is sent
1. Usually a site sends a message to another site on the link least used at that particular time
2. Adapts to load changes by avoiding routing messages on heavily used path
3. Messages may arrive out of order; This problem can be remedied by appending a sequence number to each message
4. Most complex to set up
Fixed routing: A path from A to B is specified in advance; path changes only if a hardware failure disables it.
1. Since the shortest path is usually chosen, communication costs are minimized.
2. Fixed routing cannot adapt to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Virtual routing: A path from A to B is fixed for the duration of one session.
1. Different sessions involving messages from A to B may have different paths
2. Partial remedy to adapting to load changes
3. Ensures that messages will be delivered in the order in which they were sent
Dynamic routing: The path used to send a message form site A to site B is chosen only when a message is sent
1. Usually a site sends a message to another site on the link least used at that particular time
2. Adapts to load changes by avoiding routing messages on heavily used path
3. Messages may arrive out of order; This problem can be remedied by appending a sequence number to each message
4. Most complex to set up
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