Switching Features Flashcards
Solving the broadcast storm problem, that result from connecting switches together
(STP) Spanning tree protocol shuts down redundancy, by shutting down a port that interrupts the loop
VLANS
A virtual LAN (VLAN) is any broadcast domain that is partitioned and isolated in a computer network at the data link layer (OSI layer 2). … VLANs allow network administrators to group hosts together even if the hosts are not directly connected to the same network switch.
This is done be configuring each switch port to be assigned to a particular VLAN
useful when you need to have a portion of the servers on a private network and another portion on a public network
Trunk Link
Link that connects switches together that are using VLANS
Switches add additional information (VLAN Tag) to the frame header before sending it across the trunk link, when the Frame arrives at the destination switch, it will remove the Tag and learn which VLAN the frame is intended for
Ports connected to the Trunk Link are Tagged ports
Switch Port Mirroring
Used for trouble shooting or for security (intrusion detection)
Duplicating the traffic of a port on another port and then using a data capture tool like Wireshark to analyze the traffic
Power over Ethernet (PoE)
Deliviring power over the Ethernet cable itself to avoid having to provide a seperate power supply
Protocols
802.3af
2003
15.4 Watts DC Power
802.3at
2009
25.5 Watts DC Power
