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Local Network / ARP
How does a router deliver a packet to a connected PC or router physically?
Ethernet
Framing, Error checking, Mac address
CSMA/CD
minimum frame size
ARP
Wireless Ethernet
CSMA/CA
Note: some questions to ponder
ethernet frame starts with preamble, but no ending frame marker, how come?
TCP/UDP/IP checksum is in the header. CRC is at the end (trailer), why?
other layers have "maximum" size. ethernet also has "minimum frame size", why?
you may have heard RARP, BOOTP... there are related to ARP, DHCP, wanna find out?
Bridge / Switch
What happens when my home is a big company, has many networks?
Shall I do routing within the company or switching?
Why switching? How does it work?
Mac address
self learning
(+advanced topic) spanning tree protocol, why, what?
What's the difference between switch and router, switching and routing?
VLAN (Virtual LAN)
WHY?
It is desirable and necessary to keep same group of people on the same network
security ... sniffing, hacking, confidential
necessity ... organizational separation (finance, executive, lab, operational)
administrative convenience
But, what if people are in different physical locations? Can we keep them on the same LAN again?
HOW?
port based VLAN: ports in a single physical switch are grouped together to form multiple logical switches (typically referred as different color)
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