640-802 CCNA Study Guide - Elktech.org

Cisco 640-802 Exam
Explanation:
Devices of the same layer are connected by crossover cable, while devices of different layers are
connected by straight-through cable.
Router ------ Crossover ------- Router
Router ------ Crossover ------- PC
Router ------ straight-through ------- Switch
Switch ------ straight-through ------- PC
Switch ------ Crossover ------- Switch
QUESTION NO: 163
Which of the following are true regarding bridges and switches? (Choose two.)
A. Bridges are faster than switches because they have fewer ports.
B. A switch is a multiport bridge.
C. Bridges and switches learn MAC addresses by examining the source MAC address of each
frame received.
D. A bridge will forward a broadcast but a switch will not.
E. Bridges and switches increase the size of a collision domain.
Answer: B,C
Explanation:
Bridge is a Layer2 device, which is designed to create two or more LAN segments. Each segment
is an independent collision domain. Bridge is also created to provide more available bandwidth, Its
purpose is to filter the LAN traffic, making local traffic be in the local area, and those directed to
other parts of the LAN (sub) be forwarded there. Each NIC on each device has a unique MAC
address. Bridge will record the MAC address of each port and then make forwarding decisions
based on this MAC address table.
Switch is a device of the data link layer, it combines multiple physical LAN segments into a large
network.. Similar to bridge, the switch will transfer and flood the communication frames based on
the MAC address. Because the switching process is performed in hardware, the switching speed
of the switch is faster than that of a bridge performed by software. Regarding each switching port
as a mini-bridge, then each switching port will work as an independent bridge to provide full
medium's bandwidth to each host.
QUESTION NO: 164
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