Describe Intermediate System to Intermediate System (IS-IS).
What will be an ideal response?
If you want to use a link state dynamic routing protocol and you don't want to use OSPF, your only other option is Intermediate System to Intermediate System (IS-IS). IS-IS is extremely similar to OSPF. It uses the concept of areas and send-only updates to routing tables. IS-IS was developed at roughly the same time as OSPF and had the one major advantage of working with IPv6 from the start. IS-IS is the de facto standard for ISPs. Make sure you know that IS-IS is a link state dynamic routing protocol.
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