A static EtherChannel is configured with two physical interfaces. The port-channel interface is up, but one physical interface is not included in the bundle. Which configuration issue is the most likely cause?

The physical interface has a different speed or duplex setting than the other members

The physical interface is configured as a trunk while the port-channel is in access mode

The physical interface is not assigned to any VLAN

The physical interface is administratively down

What is the primary benefit of using EtherChannel?

It allows multiple VLANs to traverse a single link by tagging frames

It provides encryption and authentication for data transmitted between switches

It enables switches to automatically discover and connect to each other without configuration

It provides redundancy and increases bandwidth by bundling multiple physical links into one logical link

A network administrator wants to prevent an unauthorized switch from becoming the root bridge. They have identified the ports that connect to the access layer where rogue switches could be plugged in. Which configuration should be applied to those ports?

`spanning-tree bpduguard enable`

`spanning-tree vlan 1 root primary`

In MST, what does the 'instance' refer to?

A group of switches that share the same configuration name

A VLAN that is assigned to a specific switch

A single spanning tree that can carry traffic for multiple VLANs

A network engineer is connecting two Cisco switches with a crossover cable. Switch A has interface GigabitEthernet0/1 configured as `switchport mode trunk`. Switch B has the same interface configured as `switchport mode dynamic desirable`. The engineer notices that the trunk is not forming. What is the most likely cause?

The native VLAN must match on both ends of the link before DTP will bring up the trunk.

A crossover cable is required for trunk links, but only if using Fast Ethernet; Gigabit Ethernet requires a straight-through cable.

The `switchport mode trunk` command does not generate DTP frames, so the `dynamic desirable` port has no trigger to negotiate.

DTP cannot negotiate a trunk when one side is set to `trunk` and the other to `dynamic desirable`.

CiscoCertified Network Professional Enterprise

Domain 3Objective 1

3.1 Layer 2 350-401 Practice Questions (Page 5)

Part of the 3.0 Infrastructure domain, which accounts for 30% of the 350-401 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~15–24 in this domain), expect 5–8 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

10concepts

30%of the exam

Questions 21–25

21foundation · easy
A static EtherChannel is configured with two physical interfaces. The port-channel interface is up, but one physical interface is not included in the bundle. Which configuration issue is the most likely cause?
Select an answer first
22foundation · easy
What is the primary benefit of using EtherChannel?
Select an answer first
23application · medium
A network administrator wants to prevent an unauthorized switch from becoming the root bridge. They have identified the ports that connect to the access layer where rogue switches could be plugged in. Which configuration should be applied to those ports?
Select an answer first
24foundation · easy
In MST, what does the 'instance' refer to?
Select an answer first
25application · medium
A network engineer is connecting two Cisco switches with a crossover cable. Switch A has interface GigabitEthernet0/1 configured as `switchport mode trunk`. Switch B has the same interface configured as `switchport mode dynamic desirable`. The engineer notices that the trunk is not forming. What is the most likely cause?
Select an answer first

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