NE NE Switching 3

Question 1

What is Link Aggregation (EtherChannel) used for in switched networks?

Accepted Answer

To bundle multiple physical links into one logical link for increased bandwidth and redundancy

Answer

EtherChannel (802.3ad/LACP) combines up to 8 physical links into one logical interface, increasing bandwidth and providing fault tolerance.

Question 2

What protocol is used to negotiate EtherChannel formation in a standards-based (non-proprietary) environment?

Accepted Answer

LACP (802.3ad)

Answer

LACP (Link Aggregation Control Protocol) is the IEEE standard for negotiating EtherChannel, while PAgP is Cisco proprietary.

Question 3

What is a Layer 3 switch capable of that a traditional Layer 2 switch cannot do?

Accepted Answer

Routing packets between VLANs using IP addresses without an external router

Answer

Layer 3 switches have hardware-based routing engines (SVIs or routed ports) that allow inter-VLAN routing at wire speed without an external router.

Question 4

What is a Switched Virtual Interface (SVI) on a Layer 3 switch?

Accepted Answer

A virtual interface associated with a VLAN used for inter-VLAN routing and management

Answer

An SVI is a virtual Layer 3 interface on a Layer 3 switch that represents an entire VLAN and provides the gateway IP for hosts in that VLAN.

Question 5

Which feature prevents traffic from being forwarded from one access port to another on the same VLAN, enhancing security?

Accepted Answer

Private VLAN (PVLAN) / Protected Ports

Answer

Private VLANs or protected ports (port isolation) block Layer 2 communication between ports in the same VLAN, forcing traffic through a router/firewall.

NE - Network Engineer Practice Test

NE - Network Engineer Practice Test

NE NE Switching 3