Packet Switching

The difference between Packet Switching and Circuit Switching is:
1. There is no difference.
2. In Circuit Switching, packets arrive at the destination in the correct sequence, while in Packet Switching they do not.
3. In Circuit Switching the lines are dedicated to the connection while in Packet Switching they are not.
4. Packet Switching is ideal for audio or video.
What is not true about Virtual Circuit Packet Switching networks?
1. There is an initial setup phase to set up a route for all packets in the connection.
2. Each packet header contains the virtual circuit identifier which identifies the connection.
3. The Virtual Circuit packet switching approach is slower than the circuit switching approach.
4. X.25 and Frame Relay use Virtual Circuit packet switching.
5. Each packet header contains full information about the destination of the packet.
What does 'non-blocking switch' mean?
1. A switch that can route any permutation of paths from distinct inputs to distinct outputs.
2. Given any connections through the switch, any unused input can be routed to any unused output.
3. A switch that can route any input to any output.
4. A switch that can route any input to any unused output.
What is true about Datagram Packet Switching networks?
1. There is an initial setup phase to set up a route for all packets in the session.
2. All sent packets by host x to host y are guaranteed to use the same path.
3. This approach does not handle a link failure well.
4. In this approach the packets must be sorted at the destination in order to get the original message.
5. The packets always arrive at the destination in the correct sequence.
How do switches route arriving packets?
1. The switches route the packets to the default router.
2. According to the IP address in the packet header.
3. The switch will send the packet on the interface with the least load.
4. On the basis of information contained in each packet header.
The primary functions supported by a switch are:
1. Routing of a cell to its correct destination port.
2. Handling several simultaneously arriving cells that are headed to a common output port.
3. Correct the errors found in the cell according to checksum on the data.
4. Both a and b are correct.
When two cells simultaneously arrive to a switch with no buffers:
1. If they are bound for the same output, one cell will be send to another output.
2. If they are bound for the same output, they will be merged into one cell.
3. If they are bound for different outputs, one cell will be lost.
4. If they are bound for the same output, one cell will be lost.
5. Both c and d are correct.
What is a beta-element?
1. Any switch which is rearrangeabe is called beta-element.
2. The basic switching element, a 2X2 switch.
3. The basic switching element, every other switch consist only from beta-elements.
4. A " + '"' + "beta X beta"+ '"' + " switch.
What is a rearrangeabe switch?
1. A switch that can route any permutation of paths from distinct inputs to distinct outputs.
2. Given any connections through the switch, any unused input can be routed to any unused output.
3. A switch that can route any input to any output.
4. A switch that can route any input to any unused output.
The Banyan Switch is:
1. A beta-element.
2. A not rearrangeable and not non-blocking switch.
3. A non-blocking switch.
4. A rearrangeable and non-blocking switch.
5. A Rearrangeable switch.

Packet Switching

Quiz