2016NEW Cisco.CCIE.(400-101)EXAM] CCIE Routing and Switching EXAM A PART10 (201-220) VCE DUMPS FOR FREE DOWNLOAD WITH 100%PASS ENSURE

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QUESTION 201

Refer to the exhibit.

Which three statements about the output are true? (Choose three.)

A. This switch is currently receiving a multicast data stream that is being forwarded out VLAN 150.

B. A multicast receiver has requested to join one or more of the multicast groups.C. Group 224.0.1.40 is a reserved address, and it should not be used for multicast user data transfer.

D. One or more multicast groups are operating in PIM dense mode.

E. One or more of the multicast data streams will be forwarded out to neighbor 10.85.20.20.

F. Group 239.192.1.1 is a reserved address, and it should not be used for multicast user data transfer.

Correct Answer: ABC

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

A. VLAN 150 shows up in the outgoing interface list so those specific multicast streams are being forwarded to this VLAN.

B. A receiver has requested to receive the multicast stream associated with the multicast address of 239.192.1.1, that is why this stream appears in the mroute

table.

C. The 224.0.1.40 is a reserved multicast group for cisco’s Rp descovery. All cisco routers are members of this grup by default and listen to this group for Cisco

RP discovery messages advertised by mapping agent even if it is not configured

QUESTION 202

Which statement about the RPF interface in a BIDIR-PIM network is true?

A. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the PIM rendezvous point.

B. In a BIDIR-PIM network, the RPF interface can be the interface that is used to reach the PIM rendezvous point or the interface that is used to reach the source.

C. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the source.

D. There is no RPF interface concept in BIDIR-PIM networks.

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

RPF stands for "Reverse Path Forwarding". The RPF Interface of a router with respect to an address is the interface that the MRIB indicates should be used to

reach that address. In the case of a BIDIR-PIM multicast group, the RPF interface is determined by looking up the Rendezvous Point Address in the MRIB. The

RPF information determines the interface of the router that would be used to send packets towards the Rendezvous Point Link for the group.

Reference. https://tools.ietf.org/html/rfc5015

QUESTION 203

Which technology is an application of MSDP, and provides load balancing and redundancy between the RPs?A. static RP

B. PIM BSR

C. auto RP

D. anycast RP

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Using Anycast RP is an implementation strategy that provides load sharing and redundancy in Protocol Independent Multicast sparse mode (PIM-SM) networks.

Anycast RP allows two or more rendezvous points (RPs) to share the load for source registration and the ability to act as hot backup routers for each other.

Multicast Source Discovery Protocol (MSDP) is the key protocol that makes Anycast RP possible.

Reference.

www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/anycast.html

QUESTION 204

Which two statements are true about IPv6 multicast? (Choose two.)

A. Receivers interested in IPv6 multicast traffic use IGMPv6 to signal their interest in the IPv6 multicast group.

B. The PIM router with the lowest IPv6 address becomes the DR for the LAN.

C. An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8.

D. The IPv6 all-routers multicast group is FF02:0:0:0:0:0:0:2.

Correct Answer: CD

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Multicast addresses in IPv6 have the prefix ff00::/8.

Reference. http://en.wikipedia.org/wiki/Multicast_address

QUESTION 205

DRAG DROP

Drag and drop the IPv6 address on the left to the correct IPv6 address type on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

QUESTION 206

DRAG DROP

Drag and drop the BGP attribute on the left to the correct category on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

QUESTION 207

DRAG DROP

Drag and drop the IPv6 multicast feature or protocol on the left to the correct address space on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

QUESTION 208

DRAG DROP

Drag and drop the multicast protocol or feature on the left to the correct address space on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

Explanation

Explanation/Reference:QUESTION 209

DRAG DROP

Drag and drop the router preference on the left to the correct routing sequence (from most preferred to least preferred) on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

ExplanationExplanation/Reference:

QUESTION 210

DRAG DROP

Drag and drop the OSPF network type on the left to the correct traffic type category on the right.

Select and Place:

Correct Answer:

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

QUESTION 211

Refer to the exhibit.

Which two pieces of information in this Wireshark capture indicate that you are viewing EIGRP traffic? (Choose two.)

A. the header length

B. the protocol number

C. the destination address

D. the Class Selector

E. the source address

F. the header checksum

Correct Answer: BC

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

EIGRP uses protocol number 88, which shows as EIGRP in the capture. Also, we in the capture that the destination IP address is 224.0.0.10, which is the

Enhanced Interior Gateway Routing Protocol (EIGRP) group address is used to send routing information to all EIGRP routers on a network segment.

QUESTION 212

When BGP route reflectors are used, which attribute ensures that a routing loop is not created?

A. weight

B. local preferenceC. multiexit discriminator

D. originator ID

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops:

Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector. The attribute carries the router ID of the originator

of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is

ignored.

Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its

clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this

attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the

cluster-list, the advertisement is ignored.

Reference.

http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfbgp.html

QUESTION 213

Refer to the exhibit.

Which statement is true about the downward bit?

A. It forces the CE router to use a backup link instead of sending traffic via MPLS VPN.

B. It informs the PE router that the LSA metric has been recently decreased to 1 and that partial SPF calculation cannot be delayed.

C. It forces the CE router to install the LSA with the downward bit set into its routing table as a discard route.

D. It informs the PE router that the LSA was already redistributed into BGP by another PE router and that the LSA must not be redistributed into BGP again.

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

From RFC 4577, specifically section 4.2.5.1

When a type 3 LSA is sent from a PE router to a CE router, the DN bit [OSPF-DN] in the LSA Options field MUST be set. This is used to ensure that if any CE

router sends this type 3 LSA to a PE router, the PE router will not redistribute it further.

When a PE router needs to distribute to a CE router a route that comes from a site outside the latter’s OSPF domain, the PE router presents itself as an ASBR

(Autonomous System Border Router), and distributes the route in a type 5 LSA. The DN bit [OSPF-DN] MUST be set in these LSAs to ensure that they will be

ignored by any other PE routers that receive them.QUESTION 214

Which regular expression will match prefixes that originated from AS200?

A. ^$

B. ^200_

C. _200$

D. ^200)

E. _200_

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Example on how to deny all prefixes originated in Autonomous System 200

router bgp 100

neighbor 10.1.1.1 remote-as 65535

neighbor 10.1.1.1 route-map map1 in

!

route-map map1 permit 10

match as-path 1

!

ip as-path access-list 5 deny _200$

ip as-path access-list 5 permit .*

Reference.

http://www.cisco.com/c/en/us/td/docs/ios/termserv/configuration/guide/12_4t/tsv_12_4t_book/tsv_r eg_express.html

QUESTION 215

Which statement describes the difference between a stub area and a totally stub area?

A. The ABR advertises a default route to a totally stub area and not to a stub area.

B. Stub areas do not allow LSA types 4 and 5, while totally stub areas do not allow LSA types 3, 4, and 5.

C. Totally stub areas allow limited external routes in the area via a special type 7 LSA, while stub .

areas do not

D. Stub areas do not allow external LSAs, ASBR summary LSAs, or summary LSAs with the exception of a default route originated by the ABR via a summary

LSA.Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Standard areas can contain LSAs of type 1, 2, 3, 4, and 5, and may contain an ASBR. The backbone is considered a standard area.

Stub areas can contain type 1, 2, and 3 LSAs. A default route is substituted for external routes.

Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA. The type 3 LSA describes a default route, substituted for all external and

inter-area routes.

Not-so-stubby areas implement stub or totally stubby functionality yet contain an ASBR. Type 7 LSAs generated by the ASBR are converted to type 5 by

ABRs to be flooded to the rest of the OSPF domain.

Reference. http://packetlife.net/blog/2008/jun/24/ospf-area-types/

QUESTION 216

Which two statements are true about IS-IS? (Choose two.)

A. IS-IS DIS election is nondeterministic.

B. IS-IS SPF calculation is performed in three phases.

C. IS-IS works over the data link layer, which does not provide for fragmentation and reassembly.

D. IS-IS can never be routed beyond the immediate next hop.

Correct Answer: CD

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

IS-IS runs directly over the data link alongside IP. On Ethernet, IS-IS packets are always 802.3 frames, with LSAPs 0xFEFE while IP packets are either Ethernet II

frames or SNAP frames identified with the protocol number 0x800. OSPF runs over IP as protocol number 89.

IS-IS runs directly over layer 2 and hence:

– cannot support virtual links unless some explicit tunneling is implemented

– packets are kept small so that they don’t require hop-by-hop fragmentation

– uses ATM/SNAP encapsulation on ATM but there are hacks to make it use VcMux encapsulation

– some operating systems that support IP networking have been implemented to differentiate Layer 3 packets in kernel. Such Oss require a lot of kernel

modifications to support IS-IS for IP routing.

– can never be routed beyond the immediate next hop and hence shielded from IP spoofing and similar Denial of Service attacks.

Reference. https://tools.ietf.org/html/draft-bhatia-manral-diff-isis-ospf-00QUESTION 217

Which command do you use to connect a dense-mode domain to a sparse-mode multicast domain?

A. none, because there is no such command

B. ip pim spt-threshold infinity

C. ip pim register dense-mode

D. ip pim dense-mode proxy-register

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

For IP PIM multicast, Cisco recommends Sparse-Mode over Dense-Mode. In the midst of our network migration, we have a new network operating in Sparse-

Mode with Anycast rendezvous point (RP) but our existing network is still operating in Dense-Mode. To bridge two different modes across both PIM domains, we

should use the ip pim dense-mode proxy-register command on the interface leading toward the bordering dense mode region. This configuration will enable the

border router to register traffic from the dense mode region (which has no concept of registration) with the RP in the sparse mode domain.

Reference. http://networkerslog.blogspot.com/2010/12/bridging-dense-mode-pim-to-sparse- mode.html

QUESTION 218

Which two statements about the function of a PIM designated router are true? (Choose two.)

A. It forwards multicast traffic from the source into the PIM network.

B. It registers directly connected sources to the PIM rendezvous point.

C. It sends PIM Join/Prune messages for directly connected receivers.

D. It sends IGMP queries.

E. It sends PIM asserts on the interfaces of the outgoing interface list.

Correct Answer: BC

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

In PIM ASM and SSM modes, the software chooses a designated router (DR) from the routers on each network segment. The DR is responsible for forwarding

multicast data for specified groups and sources on that segment.In ASM mode, the DR is responsible for unicasting PIM register packets to the RP. When a DR receives an IGMP membership report from a directly connected

receiver, the shortest path is formed to the RP, which may or may not go through the DR. The result is a shared tree that connects all sources transmitting on the

same multicast group to all receivers of that group.

In SSM mode, the DR triggers (*, G) or (S, G) PIM join messages toward the RP or the source. The path from the receiver to the source is determined hop by hop.

The source must be known to the receiver or the DR.

Reference. http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx- os/multicast/configuration/guide/n7k_multic_cli_5x/pim.html#wp1054047

QUESTION 219

Refer to the exhibit.

Which IP packets will be accepted from EBGP neighbor 10.1.1.1?

A. IP packets with a TTL count in the header that is equal to or greater than 253

B. IP packets with a TTL count in the header that is equal to 253

C. IP packets with a TTL count in the header that is equal to or greater than 2

D. IP packets with a TTL count in the header that is equal to 2

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:Reference. http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fs_btsh.html

QUESTION 220

Refer to the exhibit.

A tunnel is configured between R3 to R4 sourced with their loopback interfaces. The ip pim sparse- dense mode command is configured on the tunnel interfaces

and multicast-routing is enabled on R3 and R4. The IP backbone is not configured for multicast routing.

The RPF check has failed toward the multicast source.

Which two conditions could have caused the failure? (Choose two.)

A. The route back to the RP is through a different interface than tunnel 0.

B. The backbone devices can only route unicast traffic.

C. The route back to the RP is through the same tunnel interface.

D. A static route that points the RP to GigabitEthernet1/0 is configured.

Correct Answer: AD

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

For a successful RPF verification of multicast traffic flowing over the shared tree (*,G) from RP, an ip mroute rp-address nexthop command needs to be

configured for the RP address, that points to the tunnel interface.A very similar scenario can be found at the reference link below:

Reference. http://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/43584-mcast-over-gre.html

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