640-802 CCNA Study Guide - Elktech.org

B. Router(config)# router rip
Router(config-router)# network 192.168.1.0
Router(config-router)# network 192.168.2.0
Router(config-router)# network 192.168.3.0
C. Switch1(config)# interface fastethernet 0/1
Switch1(config-if)# switchport mode trunk
Switch1(config-if)# switchport trunk encapsulation isl
D. Router(config)# interface fastethernet 0/1.3
Router(config-if)# encapsulation dot1q 3
Router(config-if)# ip address 192.168.3.1 255.255.255.0
Answer: D
Explanation:
Here is the example of configuring the router for inter-vlan communication
RouterA(config)#int f0/0.1
RouterA(config-subif)#encapsulation ?
dot1Q IEEE 802.1Q Virtual LAN
RouterA(config-subif)#encapsulation dot1Q or isl VLAN ID
RouterA(config-subif)# ip address x.x.x.x y.y.y.y
Cisco 640-802 Exam
QUESTION NO: 350
What is the purpose of Spanning Tree Protocol?
A. to provide multiple gateways for hosts
B. to maintain a loop-free Layer 2 network topology
C. to prevent routing loops
D. to create a default route
Answer: B
Explanation:
STP (Spanning Tree protocol) is able to overcome transparent bridge in network redundancy.
Through the use of non-loop path, STP is able to avoid and eliminate network loops. It may locate
the loop and cut off link redundancy.
STP’s main task is to stop network loops from occurring on your Layer 2 network (bridges or
switches). It vigilantly monitors the network to find all links, making sure that no loops occur by
shutting down any redundant ones. STP uses the spanning-tree algorithm (STA) to first create a
topology database, then search out and destroy redundant links. With STP running, frames will
only be forwarded on the premium, STP-picked links.
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