Test 2 - CCNA 2

Which statement is true about broadcast and collision domains?

• The size of the collision domain can be reduced by adding hubs to a network.

• Adding a switch to a network will increase the size of the broadcast domain.

• Adding a router to a network will increase the size of the collision domain.

• The more interfaces a router has the larger the resulting broadcast domain.

Answer explanation

Explanation: A switch that receives a broadcast frame will forward the frame out all other interfaces, including interfaces that connect to other switches. These switches will also perform the same forwarding action. By adding more switches to the network, the size of the broadcast domain increases.

Which switch characteristic helps alleviate network congestion when a 10 Gbps port is forwarding data to a 1 Gbps port?

• high port density

• fast port speed

• fast internal switching

• frame buffering

Answer explanation

Explanation: The large frame buffers on a switch hold the ingress traffic until such time that the slower egress port can transmit the data. This reduces the number of dropped frames and alleviates network congestion.

Which switching method makes use of the FCS value?

• broadcast

• large frame buffer

• store-and-forward

• cut-through

Answer explanation

Explanation: The store-and-forward method performs error checking on the frame using the frame-check sequence (FCS) value before sending the frame. The FCS value is the last field in the frame.

What does the term “port density” represent for an Ethernet switch?

• the memory space that is allocated to each switch port

• the number of available ports

• the speed of each port

• the numbers of hosts that are connected to each switch port

Answer explanation

Explanation: The term port density represents the number of ports available in a switch. A one rack unit access switch can have up to 48 ports. Larger switches may support hundreds of ports.

Which information does a switch use to keep the MAC address table information current?

• the source MAC address and the incoming port

• the source and destination MAC addresses and the incoming port

• the source and destination MAC addresses and the outgoing port

• the destination MAC address and the incoming port

• the destination MAC address and the outgoing port

Answer explanation

Explanation: To maintain the MAC address table, the switch uses the source MAC address of the incoming packets and the port that the packets enter. The destination address is used to select the outgoing port.

Which network device can serve as a boundary to divide a Layer 2 broadcast domain?

Answer explanation

Explanation: Layer 1 and 2 devices (LAN switch and Ethernet hub) and access point devices do not filter MAC broadcast frames. Only a Layer 3 device, such as a router, can divide a Layer 2 broadcast domain.

Which network device can be used to eliminate collisions on an Ethernet network?

Answer explanation

Explanation: A switch provides microsegmentation so that no other device competes for the same Ethernet network bandwidth.

Which switching method forwards the frame immediately after examining the destination MAC address?

• adaptive switching
• fragment-free switching
• store-and-forward switching
• cut-through switching

Answer explanation

Explanation: Cut-through switching has the ability to perform rapid frame switching, which means the switch can make a forwarding decision as soon as it has looked up the destination MAC address of the frame in its MAC address table.

What happens to a port that is associated with VLAN 10 when the administrator deletes VLAN 10 from the switch?

• The port becomes tagged with VLAN 10.
• The port becomes inactive or untagged.
• The port remains associated with VLAN 10.
• The port is automatically assigned to another VLAN.

Answer explanation

Explanation: If the VLAN that is associated with a port is deleted, the port becomes inactive and cannot communicate with the network any more. To verify that a port is in an inactive state, use the show interfaces switchport command.

In which memory location are the VLAN configurations of normal range VLANs stored on a Catalyst switch?

Answer explanation

Explanation: When a normal range VLAN is created the configuration information of the VLAN is stored in flash in the vlan.dat file.