11-19-2006 12:14 PM - edited 03-03-2019 02:45 PM
Hi, can you help me on this?
Question:
If the command below is issued on the s0/0 interface,
what is the correct behavior.
router(config-if)#ip tcp header-compression passive
a)The router will only compress outgoing TCP packets if incoming
TCP packets on the same interface are compressed.
b) The L2 header will be compressed and therefore cannot be used
for WAN switching networks such as Frame Relay.
c) The L2 header will be left intact and therefore can can be used
for WAN networks such as Frame Relay.
I thought that options a) and c) are correct.
However, the book states that a) and b) are the answer for this exercise.
According to the "BCRAN", Cisco Press book, I see that the L2 header
information is left intact when tcp header-compression is used.
What I am missing?
Solved! Go to Solution.
11-19-2006 01:12 PM
Hi,
Options (a) and (c) are indeed correct. TCP header compression does not have any impact on the L2 header at all. Obviously, there is an error in the book.
Paresh
PS. Pls do remember to rate posts
11-19-2006 01:12 PM
Hi,
Options (a) and (c) are indeed correct. TCP header compression does not have any impact on the L2 header at all. Obviously, there is an error in the book.
Paresh
PS. Pls do remember to rate posts
11-19-2006 01:38 PM
Hi ,
TCP/IP header compression, as described by RFC 1144, is designed to improve the efficiency of bandwidth utilization over low-speed serial links. A typical TCP/IP packet includes a 40-byte datagram header. Once a connection is established, the header information is redundant and need not be repeated in every packet that is sent. Reconstructing a smaller header that identifies the connection and indicates the fields that have changed and the amount of change reduces the number of bytes transmitted. The average compressed header is 10 bytes long.
For this algorithm to function, packets must arrive in order. If packets arrive out of order, the reconstruction will appear to create regular TCP/IP packets but the packets will not match the original. Because priority queueing changes the order in which packets are transmitted, enabling priority queueing on the interface is not recommended.
check the below link.
Hope it helps you.
Thanks,
satish
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