>Hi All,
>
>I know I should know this, but frankly I can not remember the details to
>save my life...
>
>Let's say we have two routers connected over a serial link, they are doing
>routing, not bridging. If the serial line takes a hit who is responsible for
>retransmitting? The sending host or the first router?
>
>Now let's say same config but the routers are bridging over the serial line.
>Who retansmits, the sending host or the first bridge?
>
>TIA
>
>John Hardman
Retransmission is not inherently part of routing _or_ bridging. For
most modern environments, retransmission is done between end hosts
[1].
When retransmission is defined at the data link layer, it is done
between whatever devices are at the two ends of the link -- hosts and
hosts, hosts and routers, routers and routers, etc.
[1] In networks that follow the "end to end" assumption of the Internet,
and do not contain "midboxes" such as NATs, firewalls, proxies, tunneling
devices, etc.
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