ENCOR-Cap 1

Forwarding of network traffic from a Layer 2 perspective uses what information?

• Source IP address

• Destination IP address

• Source MAC address

• Destination MAC address

• Data protocol

Answer explanation

The switch uses the destination MAC address to identify the port out of which the packet should be forwarded.

What type of network device helps reduce the size of a collision domain?

• Hub

• Switch

• Load balancer

• Router

Answer explanation

A switch uses the MAC address table to limit the Layer 2 communication between only the two devices communicating with each other.

Forwarding of network traffic from a Layer 3 perspective uses what information?

• Source IP address

• Destination IP address

• Source MAC address

• Destination MAC address

• Data protocol

Answer explanation

The destination IP address is used to locate the longest matching route and the outbound interface out which it should be forwarded.

What type of network device helps reduce the size of a broadcast domain?

• Hub

• Switch

• Load balancer

• Router

Answer explanation

Broadcast domains do not cross Layer 3 boundaries. Splitting a Layer 2 topology into multiple subnets and joining them with a router reduces the size of a broadcast domain.

The _________ can be directly correlated to the MAC address table.

• Adjacency table

• CAM

• TCAM

• Routing table

Answer explanation

The CAM is high-speed memory that contains the MAC address table.

A ___________ forwarding architecture provides increased port density and forwarding scalability.

• Centralized

• Clustered

• Software

• Distributed

Answer explanation

A distributed architecture uses dedicated components for building the routing table, adjacency table, and forwarding engines. This allows for the forwarding decisions to be made closer to the packet’s egress and is more scalable.

CEF is composed of which components? (Choose two.)

• Routing Information Base

• Forwarding Information Base

• Label Information Base

• Adjacency table

• MAC address table

Answer explanation

CEF is composed of the adjacency table and the Forwarding Information Base.