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QUESTION 1
Which two of these statements regarding RSTP are correct? (Choose two.)

A.    RSTP cannot operate with PVST+.
B.    RSTP defines new port roles.
C.    RSTP defines no new port states.
D.    RSTP is a proprietary implementation of IEEE 802.1D STP.
E.    RSTP is compatible with the original IEEE 802.1D STP.

Answer: BE
Explanation:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

QUESTION 2
Which port state is introduced by Rapid-PVST?

A.    learning
B.    listening
C.    discarding
D.    forwarding

Answer: C
Explanation:
PVST+ is based on IEEE802.1D Spanning Tree Protocol (STP). But PVST+ has only 3 port states (discarding, learning and forwarding) while STP has 5 port states (blocking, listening, learning, forwarding and disabled). So discarding is a new port state in PVST+.

QUESTION 3
Which two states are the port states when RSTP has converged? (Choose two.)

A.    discarding
B.    listening
C.    learning
D.    forwarding
E.    disabled

Answer: AD
Explanation:
RSTP only has 3 port states that are discarding, learning and forwarding. When RSTP has converged there are only 2 port states left: discarding and forwarding.

QUESTION 4
Which three statements about RSTP are true? (Choose three.)

A.    RSTP significantly reduces topology reconverging time after a link failure.
B.    RSTP expands the STP port roles by adding the alternate and backup roles.
C.    RSTP port states are blocking, discarding, learning, or forwarding.
D.    RSTP provides a faster transition to the forwarding state on point-to-point links than STP does.
E.    RSTP also uses the STP proposal-agreement sequence.
F.    RSTP uses the same timer-based process as STP on point-to-point links.

Answer: ABD
Explanation:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

QUESTION 5
At which layer of the OSI model is RSTP used to prevent loops?

A.    physical
B.    data link
C.    network
D.    transport

Answer: B
Explanation:
RSTP and STP operate on switches and are based on the exchange of Bridge Protocol Data Units (BPDUs) between switches. One of the most important fields in BPDUs is the Bridge Priority in which the MAC address is used to elect the Root Bridge , RSTP operates at Layer 2.
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_white_paper09186a0080094cfa.shtml

QUESTION 6
What is one benefit of PVST+?

A.    PVST+ supports Layer 3 load balancing without loops.
B.    PVST+ reduces the CPU cycles for all the switches in the network.
C.    PVST+ allows the root switch location to be optimized per VLAN.
D.    PVST+ automatically selects the root bridge location, to provide optimized bandwidth usage.

Answer: C
Explanation:
Per VLAN Spanning Tree (PVST) maintains a spanning tree instance for each VLAN configured in the network. It means a switch can be the root bridge of a VLAN while another switch can be the root bridge of other VLANs in a common topology. For example, Switch 1 can be the root bridge for Voice data while Switch 2 can be the root bridge for Video data. If designed correctly, it can optimize the network traffic.

QUESTION 7
What are three characteristics of the OSPF routing protocol? (Choose three.)

A.    It converges quickly.
B.    OSPF is a classful routing protocol.
C.    It uses cost to determine the best route.
D.    It uses the DUAL algorithm to determine the best route.
E.    OSPF routers send the complete routing table to all directly attached routers.
F.    OSPF routers discover neighbors before exchanging routing information.

Answer: ACF
Explanation:
http://docwiki.cisco.com/wiki/Open_Shortest_Path_First http://www.sqa.org.uk/e-learning/NetInf203CD/page_10.htm

QUESTION 8
Which statement is true, as relates to classful or classless routing?

A.    Classful routing protocols send the subnet mask in routing updates.
B.    RIPv1 and OSPF are classless routing protocols.
C.    Automatic summarization at classful boundaries can cause problems on discontiguous subnets.
D.    EIGRP and OSPF are classful routing protocols and summarize routes by default.

Answer: C
Explanation:
RIPv1, RIPv2, IGRP, and EIGRP all auto-summarize classful boundaries by default (OSPF does not).To make discontiguous networks work, meaning you don’t want classful boundries to summarize, you need to turn off auto-summary. http://www.ciscopress.com/articles/article.asp?p=174107&seqNum=3

QUESTION 9
Which parameter or parameters are used to calculate OSPF cost in Cisco routers?

A.    Bandwidth
B.    Bandwidth and Delay
C.    Bandwidth, Delay, and MTU
D.    Bandwidth, MTU, Reliability, Delay, and Load

Answer: A
Explanation:
http://docwiki.cisco.com/wiki/Open_Shortest_Path_First

QUESTION 10
Which statements are true about EIGRP successor routes? (Choose two.)

A.    A successor route is used by EIGRP to forward traffic to a destination.
B.    Successor routes are saved in the topology table to be used if the primary route fails.
C.    Successor routes are flagged as ‘active’ in the routing table.
D.    A successor route may be backed up by a feasible successor route.
E.    Successor routes are stored in the neighbor table following the discovery process.

Answer: AD
Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f07.shtml

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