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Question
By default, which of the following factors determines the spanning-tree path cost?
A. It is the individual link cost based on latency
B. It is the sum of the costs based on bandwidth
C. It is the total hop count
D. It is dynamically determined based on load
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Answers
B
Explanation:
"The STP cost is an accumulated total path cost based on the available bandwidth of each
of the links."
Reference: Sybex CCNA Study Guide 4th Edition (Page 323)
Note:
A path cost value is given to each port. The cost is typically based on a guideline
established as part of 802.1d. According to the original specification, cost is 1,000 Mbps
(1 gigabit per second) divided by the bandwidth of the segment connected to the port.
Therefore, a 10 Mbps connection would have a cost of (1,000/10) 100.
To compensate for the speed of networks increasing beyond the gigabit range, the
standard cost has been slightly modified. The new cost values are:
Bandwidth STP Cost Value
4 Mbps 250
10 Mbps 100
16 Mbps 62
45 Mbps 39
100 Mbps 19
155 Mbps 14
622 Mbps 6
1 Gbps 4
10 Gbps 2
You should also note that the path cost can be an arbitrary value assigned by the network
administrator, instead of one of the standard cost values.
Incorrect Answers:
A, D. The STP process does not take into account the latency or load of a link. STP does
not recalculate the link costs dynamically.
C. Hop counts are used by RIP routers to calculate the cost of a route to a destination.
The STP process resides at layer 2 of the OSI model, where hop counts are not
considered. Your Comment
Explanation:
"The STP cost is an accumulated total path cost based on the available bandwidth of each
of the links."
Reference: Sybex CCNA Study Guide 4th Edition (Page 323)
Note:
A path cost value is given to each port. The cost is typically based on a guideline
established as part of 802.1d. According to the original specification, cost is 1,000 Mbps
(1 gigabit per second) divided by the bandwidth of the segment connected to the port.
Therefore, a 10 Mbps connection would have a cost of (1,000/10) 100.
To compensate for the speed of networks increasing beyond the gigabit range, the
standard cost has been slightly modified. The new cost values are:
Bandwidth STP Cost Value
4 Mbps 250
10 Mbps 100
16 Mbps 62
45 Mbps 39
100 Mbps 19
155 Mbps 14
622 Mbps 6
1 Gbps 4
10 Gbps 2
You should also note that the path cost can be an arbitrary value assigned by the network
administrator, instead of one of the standard cost values.
Incorrect Answers:
A, D. The STP process does not take into account the latency or load of a link. STP does
not recalculate the link costs dynamically.
C. Hop counts are used by RIP routers to calculate the cost of a route to a destination.
The STP process resides at layer 2 of the OSI model, where hop counts are not
considered. Your Comment
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