640-802 CCNA Study Guide - Elktech.org

Cisco 640-802 Exam
Four Cisco 2950 switches are set to their default priority settings. During the spanning-tree
process, which switch will be elected as the root bridge?
A. Switch4
B. Switch2
C. Switch1
D. Switch3
Answer: C
Explanation:
The first step of STP is root-bridge election. BPDU is used in this election process. When device
advertises BPDU, it will put its own switch ID in BPDU. Switch ID is used for the election of root
switch. Switch with a minimum switch ID is selected as root. Switch ID is composed of two
components:
1. Switch Priority: the default priority on Cisco switches is 32, 768 (two bytes in length)
2. Switches MAC address (6 bytes in length)
By default, the switch with the lowest MAC address in switching network will be root-bridge.
QUESTION NO: 449
A network administrator needs to configure a serial link between the main office and a remote
location. The router at the remote office is a non-Cisco router. How should the network
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