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QUESTION NO:1
Which two commands are required to enable multicast on a router, knowing that the receivers only
support IGMPv2? (Choose two.)
A. ip pim rp-address
B. ip pim ssm
C. ip pim sparse-mode
D. ip pim passive
Answer: A,C
Explanation:
Sparse mode logic (pull mode) is the opposite of Dense mode logic (push mode), in Dense mode
it is supposed that in every network there is someone who is requesting the multicast traffic so
PIM-DM routers begin by flooding the multicast traffic out of all their interfaces except those from
where a prune message is received to eliminate the
QUESTION NO:2
A branch router is configured with an egress QoS policy that was designed for a total number of
10 concurrent VOIP calls.
Due to expansion, 15 VOIP calls are now running over the link, but after the 14th call was
established, all calls were affected and the voice quality was dramatically degraded.
Assuming that there is enough bandwidth on the link for all of this traffic, which part of the QoS
configuration should be updated due to the new traffic profile?
A. Increase the shaping rate for the priority queue. B.
Remove the policer applied on the priority queue. C.
Remove the shaper applied on the priority queue. D.
Increase the policing rate for the priority queue.
Answer: D
Explanation:
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:13
Which two statements are true about traffic shaping? (Choose two.)
A. Out-of-profile packets are queued.
B. It causes TCP retransmits.
C. Marking/remarking is not supported.
D. It does not respond to BECN and ForeSight Messages.
E. It uses a single/two-bucket mechanism for metering.
Answer: A,C
Explanation:
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:
400-101 PDF Dumps400-101 Practice Test400-101 Study Guide
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:
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:32
Which two tunneling techniques support IPv6 multicasting? (Choose two.)
A. 6to4
B. 6over4
C. ISATAP
D. 6PE
E. GRE
Answer: B,E
Explanation:
When IPv6 multicast is supported (over a 6to4 tunnel), an IPv6 multicast routing protocol must be
used
Restrictions for Implementing IPv6 Multicast
IPv6 multicast for Cisco IOS software uses MLD version 2. This version of MLD is fully backward-
compatible with MLD version 1 (described in RFC 2710). Hosts that support only MLD version 1
will interoperate with a router running MLD version 2. Mixed LANs with both MLD version 1 and
MLD version 2 hosts are likewise supported.
IPv6 multicast is supported only over IPv4 tunnels in Cisco IOS Release 12.3(2)T, Cisco IOS
Release 12.2
(18)S, and Cisco IOS Release 12.0(26)S.
When the bidirectional (bidir) range is used in a network, all routers in that network must be able to
understand the bidirectional range in the bootstrap message (BSM).
IPv6 multicast routing is disabled by default when the ipv6 unicast-routing command is configured.
On Cisco Catalyst 6500 and Cisco 7600 series routers, the ipv6 multicast-routing also must be
enabled in order to use IPv6 unicast routing
Reference http://www.cisco.com/web/about/ac123/ac147/ac174/ac197/
about_cisco_ipj_archive_article09186a00800c830a.html
http://www.cisco.com/en/US/docs/ios/ipv6/configuration/guide/ip6-multicast.html
https://supportforums.cisco.com/thread/183386
QUESTION NO:33
Which two OSPF LSA types are new in OSPF version 3? (Choose two.)
A. Link
B. NSSA external
C. Network link
D. Intra-area prefix
E. AS domain
Answer: A,D
Explanation:
New LSA Types
OSPFv3 carries over the seven basic LSA types we’re familiar with from OSPFv2. However, the
type 1 and 2 LSAs have been re-purposed, as will be discussed in a bit. OSPFv3 also introduces
two new LSA types: Link and Intra-area Prefix.
Reference
http://packetlife.net/blog/2010/mar/2/ospfv2-versus-ospfv3/
QUESTION NO:41
On a router, interface S0 is running EIGRPv6, and interface S1 is running OSPFv3. A
redistribution command is issued under OSPFv3, redistribute EIGRP 1 metric 20 under ipv6 router
ospf 1. What will happen after applying this redistribution command?
A. All routes showing up as D and D EX in the routing table will be redistributed into OSPFv3.
B. All routes showing up as D, D EX, and C in the routing table will be redistributed into OSPFv3.
C. All routes showing up as D and D EX in the routing table and the S0 interface will be
redistributed into OSPFv3.
D. All routes showing up as D in the routing table will be redistributed into OSPFv3.
E. All routes showing up as D EX in the routing table will be redistributed into OSPFv3.
Answer: A
Explanation:
D are EIGRP Internal Routes and D EX are EIGRP external routes. Both Internal and External
EIGRP routes will be redistributed with the configuration shown above
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