compare layer of RIP vs. OSPF

From: "Choonho" <choonho@xxxxxxxx>
Date: Fri, 24 Feb 2006 14:28:58 +0900

Hello

Every one knows that RIP and OSPF protocols are routing protocols.
My question is the difference between them.

RIP uses UDP port 520.
This means that RIP format in the network layer has following shape.

+---------------+----------------+-----------------------+
| IP header | UDP header | RIP header |
+---------------+----------------+-----------------------+

However
OSPF is directly attached next to the IP header like

+---------------+-----------------+
| IP header | OSPF header |
+---------------+-----------------+

Both protocols have similar functions like routing.
Why does RIP use UDP header, OSPF does not use UDP header?

.

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