Questions and Answers
What is a Classful Routing Protocol?
This does not send subnet information when sending information to other routers. A class A, B, or C network mask is assumed. Auto-summarization is required at network boundaries. Does not support VLSM.
In classful routing, what does the router do when it receives a packet?
The router auto-summarizes the destination route to the class it belongs to. If it doesn't have that class in its routing table, it will forward the packet to the default route. If it does have the summarized route in the routing table, it will look for a subnet for the classed network. If there is a match, it will forward the packet; if there is no match, it will drop that packet.
What is a Classless Routing Protocol?
This sends subnet information when sending information to other routers. Auto-summarization is not required at network boundaries. Manual summarization is supported. VLSM is supported.
In classless routing, what does the router do when it receives a packet?
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Enable Classless Routing command
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Enable Classful Routing command
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Examples of classful routing protocols?
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Examples of classless routing protocols?
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Study Notes
Classful Routing Protocols
- Does not transmit subnet information to other routers.
- Assumes Class A, B, or C network masks.
- Requires auto-summarization at network boundaries.
- Does not support Variable Length Subnet Masking (VLSM).
Classful Routing Packet Handling
- Auto-summarizes destination route based on its class.
- Forwards to the default route if the class is absent in the routing table.
- Searches for a matching subnet within the summarized route; drops the packet if no match is found.
Classless Routing Protocols
- Sends subnet information between routers, allowing for more detailed routing.
- Does not require auto-summarization at network boundaries.
- Supports manual summarization and allows for VLSM.
Classless Routing Packet Handling
- Checks routing table for a match to the destination address.
- Forwards the packet to the matched address; uses the default route if no match exists.
Configuration Commands
- To enable Classless Routing:
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R1(config)#ip classless
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- To enable Classful Routing:
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R1(config)#no ip classless
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Examples of Routing Protocols
- Classful Routing Protocols: IGRP, RIPv1
- Classless Routing Protocols: BGPv4, EIGRP, RIPv2, OSPF
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