2A. Layer 2 Switch Operation (Multiport Transparent Bridge (Forwarding…
2A. Layer 2 Switch Operation
Multiport Transparent Bridge
Broadcast or Multicast Destination
IPv6 multicast 3333.xxxx.xxxx
IPv4 brdcst > ffff.ffff.ffff multicast > 01xx.xxxx.xxxx
STP algorithm must port is good for normal use
Record Source, and look up destination. otherwise "unknown unicast flooding"
fwd frames based on dest. MAC. Ethernet Media is not shared on all connected hosts
The collision domain’s scope is severely limited.
■ Other types of intelligent filtering or forwarding become possible.
■ You can limit broadcast traffic to a volume threshold.
■ Errors in frames are not propagated. (stored and fwd) Packets are received, stored for inspection, and then forwarded.
■ Bandwidth is no longer shared.(These frame forwarding paths change dynamically.)
■ full-duplex mode because there is no contention on the media. Hosts can talk and listen at the same time.
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Shared Media Network
1 host generate frame w/ errors, all hear it as well
1 host send, all hear it
force every host operate 1/2 duplex
1 host talk at one time
Ethernet Hubs (CSMA/CD)