ICND1 VLAN Management 3

Question 1

A network administrator wants to prevent a rogue switch from becoming a VTP server. Which action should be taken?

Accepted Answer

Set all switches to VTP transparent mode

Answer

VTP transparent mode switches do not participate in VTP synchronization, so a rogue switch in transparent mode cannot update the VLAN database.

Question 2

Which command assigns ports Fa0/1 through Fa0/5 to VLAN 30 in a single step on a Cisco switch?

Accepted Answer

interface range FastEthernet 0/1-5 then switchport access vlan 30

Answer

The 'interface range' command selects multiple interfaces simultaneously, and 'switchport access vlan 30' assigns them all to VLAN 30.

Question 3

What does the 802.1Q tag inserted into an Ethernet frame contain?

Accepted Answer

VLAN ID and a 3-bit priority field (CoS)

Answer

The 4-byte 802.1Q tag includes a 12-bit VLAN ID (supporting VLANs 1–4094) and a 3-bit Class of Service (CoS) priority field.

Question 4

An administrator issues 'switchport trunk allowed vlan 10,20,30' on a trunk interface. What is the effect?

Accepted Answer

Only VLANs 10, 20, and 30 are allowed; all others are pruned

Answer

Using 'switchport trunk allowed vlan' (without 'add') replaces the entire allowed list with only the specified VLANs.

Question 5

Which VTP mode allows a switch to create and modify VLANs locally but does not propagate changes to other switches?

Accepted Answer

Transparent mode

Answer

VTP transparent mode lets a switch manage its own local VLAN database without advertising changes to or accepting updates from other VTP devices.

(ICND1) Interconnecting Cisco Networking Devices Part 1 Practice Test