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QUESTION NO:4

Refer to the exhibit.

R1 has an EBGP session to ISP 1 and an EBGP session to ISP 2. R1 receives the same prefixes

through both links.

Which configuration should be applied so that the link between R1 and ISP 2 will be preferred for

outgoing traffic (R1 to ISP 2)?

A. Increase local preference on R1 for received routes

B. Decrease local preference on R1 for received routes

C. Increase MED on ISP 2 for received routes

D. Decrease MED on ISP 2 for received routes

Answer: A

Explanation: Explanation

Local preference is an indication to the AS about which path has preference to exit the AS in order

to reach a certain network. A path with higher local preference is preferred more. The default value

of preference is 100.

Reference

http://www.cisco.com/en/US/tech/tk872/technologies_configuration_example09186a0080b82d1f.s

html?

referring_site=smartnavRD

QUESTION NO:9

Which two are effects of connecting a network segment that is running 802.1D to a network

segment that is running 802.1w? (Choose two.)

A. The entire network switches to 802.1D and generates BPDUs to determine root bridge status. B.

A migration delay of three seconds occurs when the port that is connected to the 802.1D bridge

comes up.

C. The entire network reconverges and a unique root bridge for the 802.1D segment, and a root

bridge for the 802.1w segment, is chosen.

D. The first hop 802.1w switch that is connected to the 802.1D runs entirely in 802.1D compatibility

mode and converts the BPDUs to either 802.1D or 802.1w BPDUs to the 802.1D or 802.1w

segments of the network.

E. Classic 802.1D timers, such as forward delay and max-age, will only be used as a backup, and

will not be necessary if point-to-point links and edge ports are properly identified and set by the

administrator.

Answer: B,E

Explanation:

Each port maintains a variable that defines the protocol to run on the corresponding segment. A

migration delay timer of three seconds also starts when the port comes up. When this timer runs,

the current STP or RSTP mode associated to the port is locked. As soon as the migration delay

expires, the port adapts to the mode that corresponds to the next BPDU it receives. If the port

changes its mode of operation as a result of a BPDU received, the migration delay restarts.

802.1D works by the concept that the protocol had to wait for the network to converge before it

transitioned a port into the forwarding state. With Rapid Spanning Tree it does not have to rely on

any timers, the only variables that that it relies on is edge ports and link types.

Any uplink port that has an alternate port to the root can be directly placed into the forwarding

state (This is the Rapid convergence that you speak of “restored quickly when RSTP is already in

use?”). This is what happened when you disconnected the primary look; the port that was ALT,

moved to FWD immediately, but the switch also still needs to create a BDU with the TC bit set to

notify the rest of the network that a topology has occurred and all non-edge designated ports will

transition to BLK, LRN, and then FWD to ensure there are no loops in the rest of the network. This

is why if you have a host on a switchport, and you know for a fact that it is only one host, enable

portfast to configure the port as an edgeport so that it does not have to transition to all the STP

states.

Reference

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

QUESTION NO:14

Which three options are features of VTP version 3? (Choose three.)

A. VTPv3 supports 8K VLANs.

B. VTPv3 supports private VLAN mapping.

C. VTPv3 allows for domain discovery.

D. VTPv3 uses a primary server concept to avoid configuration revision issues.

E. VTPv3 is not compatible with VTPv1 or VTPv2.

F. VTPv3 has a hidden password option.

Answer: B,D,F

Explanation:

Key Benefits of VTP Version 3

Much work has gone into improving the usability of VTP version 3 in three major areas:

The new version of VTP offers better administrative control over which device is allowed to update

other devices’ view of the VLAN topology. The chance of unintended and disruptive changes is

significantly reduced, and availability is increased. The reduced risk of unintended changes will

ease the change process and help speed deployment.

Functionality for the VLAN environment has been significantly expanded. Two enhancements are

most beneficial for today’s networks:

QUESTION NO:18

Refer to the exhibit.

Which statement is correct about the prefix 160.0.0.0/8?

A. The prefix has encountered a routing loop.

B. The prefix is an aggregate with an as-set.

C. The prefix has been aggregated twice, once in AS 100 and once in AS 200.

D. None of these statements is true.

Answer: B

Explanation:

QUESTION NO:20

Refer to the exhibit.

What is the potential issue with this configuration?

A. There is no potential issue; OSPF will work fine in any condition.

B. Sub-optimal routing may occur since there is no area 1 adjacency between the ABRs.

C. This is a wrong OSPF configuration because all routers must be in area 0 only.

D. This is a wrong OSPF configuration because /30 requires 0.0.0.3 wild card.

Answer: B

Explanation:

Latest 400-101 Dumps400-101 Study Guide400-101 Exam Questions

QUESTION NO:31

How will EIGRPv6 react if there is an IPv6 subnet mask mismatch between the Global Unicast

addresses on a point-to-point link?

A. EIGRPv6 will form a neighbor relationship.

B. EIGRPv6 will not form a neighbor relationship.

C. EIGRPv6 will form a neighbor relationship, but with the log MSG: “EIGRPv6 neighbor not on a

common subnet.”

D. EIGRPv6 will form a neighbor relationship, but routes learned from that neighbor will not be

installed in the routing table.

Answer: A Explanation:

http://www.ietf.org/rfc/rfc3587.txt

QUESTION NO:38

Refer to the exhibit.

This is an MPLS VPN network with OSPF as the PE-CE routing protocol. Which statement is

correct?

A. The routing inside the VPN RED will never work correctly.

B. The routing inside the VPN RED can be enabled by configuring virtual links between the PE

routers.

C. The routing inside the VPN RED can be enabled by configuring area 0 inside the VRF on the

PE routers.

D. The routing inside the VPN RED will work without any special OSPF configuration.

E. The routing inside the VPN RED will work if the PE routers have a full mesh of sham-links

configured for VRF RED.

Answer: D Explanation:

http://www.cisco.com/en/US/docs/net_mgmt/vpn_solutions_center/1.1/user/guide/VPN_UG1.html

QUESTION NO:45

Refer to the exhibit.

What does the incoming interface of the above (*, G) entry indicate?

A. the interface closest to the source, according to the unicast routing table

B. the interface where an IGMP join has been received

C. the interface with the highest IP address

D. the last interface to hear a PIM (*, G) join

E. the interface closest to the RP, according to the unicast routing table

Answer: E

Explanation:

Source Trees

A source tree is the simplest form of distribution tree. The source host of the multicast traffic is

located at the root of the tree, and the receivers are located at the ends of the branches. Multicast

traffic travels from the source host down the tree toward the receivers. The forwarding decision on

which interface a multicast packet should be transmitted out is based on the multicast forwarding

table. This table consists of a series of multicast state entries that are cached in the router. State

entries for a source tree use the notation (S, G) pronounced S comma G. The letters represents

the IP address of the source, and G represents the group address.

Shared Trees

Shared trees differ from source trees in that the root of the tree is a common point somewhere in

the network.

This common point is referred to as the rendezvous point (RP). The RP is the point at which

receivers join to learn of active sources. Multicast sources must transmit their traffic to the RP.

When receivers join a multicast group on a shared tree, the root of the tree is always the RP, and

multicast traffic is transmitted from the RP down toward the receivers. Therefore, the RP acts as a

go-between for the sources and receivers. An RP can be the root for all multicast groups in the

network, or different ranges of multicast groups can be associated with different RPs.

Multicast forwarding entries for a shared tree use the notation (*, G), which is pronounced star

comma G. This is because all sources for a particular group share the same tree. (The multicast

groups go to the same RP.)

Therefore, the * or wildcard represents all sources.

Additional Information from Microsoft

Multicast traffic from source 162.10.4.1 (for example) uses the RPT, meaning the source sends it

to the RP rather than to the multicast group (the router would denote this by having a (*, G) entry

rather than a (S, G) entry). Before sending this traffic, Router 1 checks its unicast routing table to

see if packets from the RP are arriving on the correct interface. In this case they are, because they

arrive on interface I1, and the packets are forwarded.

Reference

http://technet.microsoft.com/en-us/library/bb742462.aspx

QUESTION NO:48

Which IGMPv2 message contains a non-zero “Max Response Time”?

A. Membership Query

B. Membership Report

C. Membership Delay

D. Backward Compatible IGMPv1 Report Message

Answer: A

Explanation:

QUESTION NO:49

Refer to the exhibit.

Which IGMPv2 message is displayed in the output of the packet capture?

A. General Query

B. Membership Report

C. Membership Query

D. Membership Delay

Answer: B

Explanation:

Reference

http://wiki.wireshark.org/IGMP

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