Basic Network and Routing Concepts - Connecting Remote Locations with the Headquarters - Routing over GRE Tunnel

4 important questions on Basic Network and Routing Concepts - Connecting Remote Locations with the Headquarters - Routing over GRE Tunnel

Name the 3 main components of a GRE tunnel

- A passenger protocol or encapsulated protocol, such as IPv4 or IPv6, which is being encapsulated.
- A carrier protocol that is defined by Cisco as a multiprotocol carrier protocol and described in RFC 2784
- A transport protocol, such as IP, that carries the encapsulated protocol

What are the Characteristics of GRE?

- GRE uses a protocol-type field in the GRE header to support the encapsulation of any OSI L3 protocol
- GRE itself is stateless. It does not include any flow-control mechanisms, by default
- GRE does not include any strong security mechanisms to protect its payload
- the GRE header, along with the tunneling IP header, creates at least 24 bytes of additional overhead for tunneled packets

What is the main benefit of the GRE tunnel

That is supports IP multicast and therefore is appropriate for tunneling routing protocols.
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What risk does GRE have

not encrypted.

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