Chapter 2
Which three components are combined to form a bridge ID?
bridge priority extended system ID MAC address
Which nonproprietary protocol provides router redundancy for a group of routers which support IPv4 LANs?
VRRPv2
The default hello timer value for STP BPDU frames is___________ seconds.
2
Rapid PVST+
A cisco enhancement of RSTP to provide a spanning-tree instance for each VLAN
During the implementation of Spanning Tree Protocol, all switches are rebooted by the network administrator. What is the first step of the spanning-tree election process?
All the switches send out BPDUs advertising themselves as the root bridge
What could be the effect of duplicate unicast frames arriving at a destination device due to multiple active alternative physical paths?
Application protocols malfunction.
Which Cisco switch feature ensures that configured switch edge ports do not cause Layer 2 loops if a port is mistakenly connected to another switch?
BPDU guard
Which two issues are the result of a broadcast storm?
Due to high processing demands during a broadcast storm, communication may fail between end stations in the broadcast domain. During a broadcast storm, constant changes to the MAC address table prevent a switch from accurately forwarding frames.
After the election of the root bridge has been completed, how will switches find the best paths to the root bridge?
Each switch will analyze the sum of all port costs to reach the root and use the path with the lowest cost.
A network administrator is overseeing the implementation of first hop redundancy protocols. Which two protocols will not be able to function with multivendor devices?
HSRP GLBP
When first hop redundancy protocols are used, which two items will be shared by a set of routers that are presenting the illusion of being a single router?
IP address MAC address
Which statement describes HSRP?
It is used within a group of routers for selecting an active device and a standby device to provide gateway services to a LAN.
What value determines the root bridge when all switches connected by trunk links have default STP configurations?
MAC address
What is one way to correct a spanning tree failure?
Manually remove redundant links in the switched network
Which is the default STP operation mode on Cisco Catalyst switches?
PVST +
What is an advantage of PVST+?
PVST+ optimizes performance on the network through load sharing.
To obtain an overview of the spanning tree status of a switched network, a network engineer issues the show spanning-tree command on a switch. Which two items of information will this command display?
The role of the ports in all VLANs. The root bridge BID.
Which two statements describe a switch port that is configured with PortFast?
The switch port immediately transitions from blocking to the forwarding state. The switch port should never receive BPDUs.
What additional information is contained in the 12-bit extended system ID of a BPDU?
VLAN ID
MSTP
a protocol that allows multiple vlans to run in a single spanning-tree instance
What is an accurate description of redundancy?
designing a network to use multiple paths between switches to ensure there is no single point of failure
Which three port states are used by Rapid PVST+?
discarding learning forwarding
Which two concepts relate to a switch port that is intended to have only end devices attached and intended never to be used to connect to another switch?
edge port PortFast
In which two port states does a switch learn MAC addresses and process BPDUs in a PVST network?
learning forwarding
STP
legacy standard for spanning tree
When PVST is running over a switched network, which port state can participate in BPDU frame forwarding based on BPDUs received, but does not forward data frames?
listening
To enable Rapid PVST+ on a Cisco switch, the spanning-tree mode ___________________________________ global configuration mode command is required
rapid-pvst
Which two network design features require Spanning Tree Protocol (STP) to ensure correct network operation?
redundant links between Layer 2 switches removing single points of failure with multiple Layer 2 switches
Which STP port role is adopted by a switch port if there is no other port with a lower cost to the root bridge?
root port
An administrator is troubleshooting a switch and wants to verify if it is a root bridge. What command can be used to do this?
show spanning-tree
Which STP priority configuration would ensure that a switch would always be the root switch?
spanning-tree vlan 10 priority 0
In FHRP operation, two or more routers are represented as a single ______________________________ router.
virtual