Question 1.
Ethernet switches learn MAC addresses from:

a) Periodic routing updates
b) Destination addresses of seen frames
c) Source address of seen frames
d) STP BPDUs

Answer

Question 2.
Which specifications support Fast Ethernet on Category 3 cables?
(Choose 2)

a) 100BaseTX
b) 100BaseFX
c) 100BaseT2
d) 100BaseT4

Answer

Question 3.
IEEE 802.1d Spanning Tree Protocol, by default, generates BPDUs every

a) 1 Second
b) 2 Seconds
c) 15 Seconds
d) 20 Seconds

Answer

Answers

Question 1.
Ethernet switches learn MAC addresses from:

a) Periodic routing updates
b) Destination addresses of seen frames
c) Source address of seen frames
d) STP BPDUs

Answer
c) Source address of seen frames

Explanation
Switches, like all transparent bridges, learn about MAC address from the Source MAC addresses in the frames it sees.
[3805]

Question 2.
Which specifications support Fast Ethernet on Category 3 cables?
(Choose 2)

a) 100BaseTX
b) 100BaseFX
c) 100BaseT2
d) 100BaseT4

Answer
c) 100BaseT2
d) 100BaseT4

Explanation
100BaseT2 supports 100Mbps over Cat 3 wiring using two wire pairs. 100BaseT4 uses 4 pairs. 100BaseTX requires Cat 5, and 100BaseFx requires fiber.
[3806]

Question 3.
IEEE 802.1d Spanning Tree Protocol, by default, generates BPDUs every

a) 1 Second
b) 2 Seconds
c) 15 Seconds
d) 20 Seconds

Answer
b) 2 Seconds

Explanation
By default, the root bridge of the Spanning Tree will generate a BPDU every 2 seconds.
[3807]