Ccna certification Practice Tests

285

 9.  C.  Static VLANs are VLANs that have been manually configured vs. dynamic VLANs 

that are configured via a VLAN Membership Policy Server (VMPS). A node will not 

know which VLAN it is assigned to when it is statically set via the command 

switchport 

access vlan 3. Nodes use a VLAN Membership Policy Server (VMPS) if the VLAN is 

dynamically configured. Nodes are not assigned VLANs based on their MAC addresses 

when they are statically configured. All nodes are not necessarily in the same VLAN when 

static VLANs are being used.

 10.  D.  The addition of another VLAN will increase the effective bandwidth by adding 

additional broadcast domains. A router is required to route between VLANs. However, 

it will not be required if you are logically partitioning the switch via VLANs. The switch 

will not necessarily increase the count of collision domains.

 11.  B.  When adding VLANs, you immediately increase the number of broadcast domains. 

At the same time, you increase collision domains. If a switch had 12 ports and they all 

negotiated at 100 Mb/s half-duplex (one collision domain), when a VLAN is added you 

will automatically create two collision domains while adding an additional broadcast 

domain.

 12.  C.  Dynamic VLANs are deprecated, but you may still see them in operations. A switch 

configured with dynamic VLANs checks a VLAN Management Policy Server (VMPS) 

when clients plug in. The VMPS has a list of MAC addresses to their respective VLANs. 

It is now recommended that dynamic VLAN installations are converted to 802.1x. The 

access port cannot be controlled with a VMPS based upon user credentials. The access 

port is also not switched into the respective VLAN based upon the computer’s IP address, 

because the IP address is normally associated based upon the VLAN. The access port 

cannot be switched into a respective VLAN based upon ACLs since ACLs are used to 

restrict layer 3 traffic and not layer 2 traffic.

 13.  D.  To verify a VLAN name change, you would use the command 

show vlan id 3. 

This would only show you the one VLAN configured in the database. The command 

show vlans is incorrect because the command is not plural; it is singular, show vlan. 

It will give you a complete listing of all VLANs. Performing a 

show interface vlan 3 

would not display the friendly name. The command 

show run will not display the VLAN 

database, unless the switch is configured in transparent mode.

 14.  D.  When the MTU is changed on the VLAN, it has little consequence to normal MTU 

communications. However, if you are going to utilize the new MTU for something like 

iSCSI, it must be supported end to end or it can actually decrease performance. All 

switching equipment between the two end devices must support jumbo frames. Clients 

will not auto-detect the new MTU in IPv4 and use jumbo frames; the client normally must 

be configured to use the new MTU. Configuring the MTU can be difficult because you 

must make sure that all devices end to end support the new MTU.

 15.  C.  When layer 3 (routed VLANs) is implemented, it allows for a more secure network 

with the use of ACLs applied to the VLAN interface. A single VLAN spanning multiple 

switches is a benefit of implementing VLANs and not routed VLANs. When you 

implement VLANs, you will increase the number of broadcast domains.

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