Shared Flashcard Set

Details

CCNA 3 - CH 5 - STP
Cisco's - LAN Switching and Wireless
11
Computer Networking
Undergraduate 2
10/14/2011

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Cards

Term
What is the default TTL for ethernet frames?
Definition
None -- ethernet frames do not have a TTL field.
Term
What is STA and what does it do?
Definition
Spanning Tree Algorithm. Determines which ports on a network need to be blocked in order to provide a loop free environment.
Term
Link speed costs
10Gig
1 Gig
100 Mbps
10 Mbps
Definition
10 Gig -- 2
1 Gig -- 4
100 Mbps - 19
10 Mbps - 100
Term
Name the RSTP port states
Definition
1. Discarding
2. Learning
3. Forwarding
Term
In PVST which type of ports automatically transition to the forwarding state?
Definition
Edge ports and Portfast ports.
Term
If there is a broadcast storm and you are not able to telnet to a router / switch what is another way to access the device?
Definition
Console cable
Term
Before troubleshooting a bridging loop it is necessary to know which three pieces of information?
Definition
Topology of the bridge network
Location of the root bridge
Location of the blocked ports and the redundant links
Term
What is the purpose of BPDU guard?
Definition
It disables a port configured as PortFast if it receives a BPDU.
Term
What is the convergence time of 802.1D and 802.1w?
Definition
802.1D -- 50 Seconds
802.1w -- 6 seconds
Term
What are two problems associated with redundant switched Ethernet topologies?
Definition
Broadcast storms and multiple frame copies
Term
Which three timers determine the STP performance and state changes? What are their defaults?
Definition
Hello Time -- 2 seconds
Forward Delay ---15 seconds
Maximum Age -- 20 seconds
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