Classless Addressing: All IP addresses other then the above prefix lenghts are called classless. But there is a condition to use it, mean you must be use a longer/equal prefix lenght for it from there own …

Classless addressing throws out all fixed forms of Classful addressing. And because it does so, routers need extra information to extract the network address or number from a destination address. This …

After subnetting, that is classless addressing, all the 1's combined (network bits +subnet bits) represent one single network and the zero's the host part/bits.

That is classless addressing, an efficiently designed scheme. VLSM - That is further subnetting an already subnetted subnet, again one of the reasons to that is to assign different subnets to different …

On a practical level, classful routing protocols (rip1, igrp) do not carry subnet mask information, classless routing protocols do. And classless routing protocols can handle CIDR masks.

Im a bit confused as to the difference between classless and classful addressing, I understand that classful has 3 parts network, subnet and host, which means a class A B or C network that can be …

You are correct. Keep in mind that route summarization between the most commonly encountered classless routing protocols (EIGRP and OSPF) work differently.

With "ip classless", packets destined to an address are strictly matched against the most specific route in the route table. If no match exists, the default route can be used. Classful (no ip classless) …

By definition, classless routing protocols advertise the mask with each advertised route, and classful routing protocols do not." i.e. RIP-2, EIGRP, or OSPF support VLSM, and are considered classless.

B) no auto-summary C) no ip classless D) auto-summary I of course chose B, since I've never heard of the ip classless command. The correct answer turned out to be A. My question is.. the "ip classless" …