SWRE Unit 9

A network administrator configured routers R1 and R2 as part of HSRP group 1. After the routers have been reloaded, a user on Host1 complained of lack of connectivity to the Internet The network administrator issued the show standby brief command on both routers to verify the HSRP operations. In addition, the administrator observed the ARP table on Host1. Which entry should be seen in the ARP table on Host1 in order to gain connectivity to the Internet?

• • The virtual IP address and the virtual MAC address for the HSRP group 1

• • The virtual IP address of the HSRP group 1 and the MAC address of R1

• The virtual IP address of the HSRP group 1 and the MAC address of R2

• • The IP address and the MAC address of R1

What protocol or technology defines a group of routers, one of them defined as active and another one as standby?

• EtherChannel

• VTP

• HSRP

• DTP

Which destination MAC address is used when frames are sent from the workstation to the default gateway?

• MAC address of the virtual router

• • MAC address of the standby router

• • MAC addresses of both the forwarding and standby routers

• • MAC address of the forwarding router

Answer explanation

The IP address of the virtual router acts as the default gateway for all the workstations. Therefore, the MAC address that is returned by the Address Resolution Protocol to the workstation will be the MAC address of the virtual router.

With a HSRP configuration, once the forwarding router fails what happens next?

• The host initiates an ARP request for the MAC address of the new forwarding router

• The standby router stops seeing hello messages from the forwarding router.

• The Forwarding router reboots

• The standby router assumes the role of the forwarding router using both IP and MAC addresses of the virtual router

With a HSRP configuration, the forwarding router has failed and the Standby router stops seeing hello messages from the forwading router what happens next?

• The host initiates an ARP request for the MAC address of the new forwarding router

• The standby router stops seeing hello messages from the forwarding router.

• The Forwarding router reboots

• The standby router assumes the role of the forwarding router using both IP and MAC addresses of the virtual router

What protocol or technology uses a standby router to assume packet-forwarding responsibility if the active router fails?

• EtherChannel

• VTP

• HSRP

• DTP

A network administrator has connected two switches together using EtherChannel technology. If STP is running, what will be the end result?

• • The switches will load balance and utilize both EtherChannels to forward packets.

• • STP will block one of the redundant links.

• • The resulting loop will create a broadcast storm.

• • Both port channels will shutdown.

Answer explanation

Cisco switches support two protocols for negotiating a channel between two switches: LACP and PAgP. PAgP is Cisco-proprietary. In the topology shown, the switches are connected to each other using redundant links. By default, STP is enabled on switch devices. STP will block redundant links to prevent loops.

Host A has sent a packet to host B. What will be the source MAC and IP addresses on the packet when it arrives at host B?

• • Source MAC: 00E0.FE10.17A3
    Source IP: 10.1.1.10

• • Source MAC: 00E0.FE10.17A3
    Source IP: 192.168.1.1

• • Source MAC: 00E0.FE91.7799
    Source IP: 10.1.1.10

• • Source MAC: 00E0.FE91.7799
    Source IP: 10.1.1.1

• • Source MAC: 00E0.FE91.7799
    Source IP: 192.168.1.1

Answer explanation

As a packet traverses the network, the Layer 2 addresses will change at every hop as the packet is de-encapsulated and re-encapsulated, but the Layer 3 addresses will remain the same.

Which two VTP modes allow for the creation, modification, and deletion of VLANs on the local switch? (Choose two)

• • client

• • Master

• Server

• Slave

• Transparent

A network administrator is preparing the implementation of Rapid PVST+ on a production network. How are the Rapid PVST+ link types determined on the switch interfaces?

• • Link types can only be configured on access ports configured with a single VLAN.

• • Link types can only be determined if PortFast has been configured.

• • Link types are determined automatically.

• • Link types must be configured with specific port configuration commands.

Answer explanation

When Rapid PVST+ is being implemented, link types are automatically determined but can be specified manually. Link types can be either point-to-point, shared, or edge.