640-802 CCNA - VLAN

Question 1

Q.208 - What are three valid reasons to assign ports to VLANs on a switch? (Choose three.)

A. to make VTP easier to implement

B. to isolate broadcast traffic

C. to increase the size of the collision domain

D. to allow more devices to connect to the network

E. to logically group hosts according to function

F. to increase network security

Answer 1

Answer: BEF

VLAN has the following advantages:

1. Restrict broadcast domain. That is to say each VLAN is a Broadcast domain, which saves
   bandwidth and improves the network performance.
2. Enhance the LAN security. Datagrams in different VLANs transmit separately, that is to say
   users in one VLAN can’t directly communicate with users in other VLANs, if they want to
   communicate, devices such as routers and layer3 switches are required.
3. Establish a virtual working group flexibly. VLAN can group different users into different working
   team regardless of their physical location, which makes network establishment and maintenance
   more flexible.

Question 2

Q. 424 - Which three elements must be used when you configure a router interface for VLAN trunking? (Choose three.)

A. one physical interface for each subinterface

B. one IP network or subnetwork for each subinterface

C. a management domain for each subinterface

D. subinterface encapsulation identifiers that match VLAN tags

E. one subinterface per VLAN

F. subinterface numbering that matches VLAN tags

Answer 2

Answer: BDE

Question 3

Q. 87 - A switch is configured with all ports assigned to VLAN 2. In addition, all ports are configured as full-duplex FastEthernet.
What is the effect of adding switch ports to a new VLAN on this switch?

A. The additions will create more collisions domains.

B. An additional broadcast domain will be created.

C. More bandwidth will be required than was needed previously.

D. IP address utilization will be more efficient.

Answer 3

Answer: B

Question 4

Q. 77 - Which two benefits are provided by creating VLANs? (Choose two.)

A. added security

B. dedicated bandwidth

C. provides segmentation

D. allows switches to route traffic between subinterfaces

E. contains collisions

Answer 4

Answer: AC

Question 5

Q. 40 - Which three of these statements regarding 802.1 Q trunking are correct? (Choose three.)

A. 802.1 Q native VLAN frames are untagged by default.

B. 802.1 Q trunking ports can also be secure ports.

C. 802.1 Q trunks can use 10 Mb/s Ethernet interfaces.

D. 802.1 Q trunks require full-duplex, point-to-point connectivity.

E. 802.1 Q trunks should have native VLANs that are the same at both ends.

Answer 5

Answer: ACE