Ch. 3.3 Flashcards
What is LACP?
Link Aggregation Control Protocol
What’s the maximum length of a standard Ethernet frame?
1,518 bytes excluding preamble. Each frame has 18-byte header
What is MTU?
Maximum Transmission Unit
How many bytes does a Jumbo Frame have?
9,216 bytes
How do you implement jumbo frame support?
What command enables jumbo frames?
Configure the switches at the network
mtu 9018
What is Spanning Tree Protocol for?
Means for bridges/switches to organize themselves into a hierarchy and block loops in a hybrid mesh network
What is the switch at the top of the STP called?
Does it have the highest or lowest ID?
Root
Lowest ID
What is BPDU called?
What is it used for?
Bridge Protocol Data Unit
Determining the shortest path to the root
What is a root port?
A port that forwards “up” to the root
What is a designation port?
A port that forward traffic “down” the network
What does the root bridge selection do?
What are 2 qualities that a root should have?
The process a network find which switch will be the root bridge.
High bandwidth backbone or core switch group
What does “show spanning-tree” command do?
Shows current configuration
What does “spanning-tree id root primary” and “spanning tree id root secondary” do?
Assigns main and backup priority values to chosen switches.
What is the Blocking state mean in STP?
What is Forwarding state mean in STP?
Port drops all frames except BPDUs
Port works as normal
What is the Listening state mean STP?
What is the Learning state mean in STP?
What is the Disabled state mean in STP?
Port is listening for BPDUs to detect loops
Port discovers network topology and builds MAC address table
Port is disabled by administrator
How much Wattage does 802.3af supply?
How much Wattage does 802.3at (PoE+) supply?
How much Wattage does 802.3bt (PoE++) supply?
13W
25W
51W and 71W
On a Cisco Switch, what does the command “power inline auto max 15000” mean?
Enables a port with maximum output of 15W
