Free Download Cisco 350-001 VCE Test Engine Full Version Now (261-270)
QUESTION 261
What does the beginning of a multicast address look like, if it is used for embedded RP?
A. FF7
B. FF
C. FF3
D. Embedded RP does not use any special IPv6 address.
Answer: A
Explanation:
Embedded RP defines an address allocation policy in which the address of the RP is encoded in an IPv6 multicast group address. This allows an easy deployment of scalable inter-domain multicast and simplifies the intra-domain multicast configuration as well. IPv6 Multicast group addresses embedded with RP information start with ff70::/12 where the flag value of 7 means embedded RP.
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6552/whitepaper_c11-508498.html
QUESTION 262
Which statement best describes OSPF external LSAs (type 5)?
A. OSPF external LSAs are automatically flooded into all OSPF areas, unlike type 7 LSAs, which
require that redistribution be configured.
B. External LSAs (type 5) are automatically changed to type 1 LSAs at ASBRs.
C. Type 5 LSAs are route summaries describing routes to networks outside the OSPF Autonomous
System.
D. External network LSAs (type 5) redistributed from other routing protocols into OSPF are not
permitted to flood into a stub area
Answer: D
Explanation:
Type 5 – External LSA – these LSAs contain information imported into OSPF from other routing processes.
They are flooded to all areas (except stub areas). For “External Type 1” LSAs routing decisions are made by adding the OSPF metric to get to the ASBR and the external metric from there on, while for “External Type 2” LSAs only the external metric is used. The link-state ID of the type 5 LSA is the external network number
http://en.wikipedia.org/wiki/Link-state_advertisement
QUESTION 263
This question is about the formation of OSPF adjacency. An OSPF adjacency will not form
correctly across a point-to-point link in the same area. Which would most likely cause this
problem?
A. Each interface has a different OSPF cost.
B. Each interface is configured with secondary addresses as well as primary addresses.
C. Each interface has a different MTU size.
D. Each interface is configured with the ip unnumbered loopback 0 command.
Answer: C
Explanation:
http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0e.shtml Cisco General Networking Theory Quick Reference Sheets
QUESTION 264
Which command is used to enable SSM with the range 232.0.0.0/8?
A. ip pim ssm default
B. ip pim ssm 232.0.0.0 255.0.0.0
C. ip pim ssm range 50 access-list 50 permit 232.0.0.0 15.255.255.255
D. ip pim enable default
Answer: A
Explanation:
http://packetlife.net/blog/2010/jul/27/source-specific-multicast-pim-ssm/ (see PIM-SSM configuration)
QUESTION 265
Based on the information in the exhibit, which statement is true?
A. RTC will be able to access the 10.0.0.0 network.
B. RTC will not have the 10.0.0.0 network in its routing table.
C. RTC will not have the 192.168.10.0 network in its routing table.
D. RTB will not have the 10.0.0.0 network in its routing table.
E. RTB and RTC will not have the 10.0.0.0 network in their routing tables.
Answer: B
Explanation:
Distribute lists are used to control routing updates. A distribute list allows an access-list to be applied to routing updates. When you configure an access list and use it with a distribute list routing updates can be controlled no matter what their source is. Access list should permit the networks that you want advertised or redistributed and deny all networks that you want to remain hidden. Router then applies the access list to routing updates for that protocol. RTC will not be able to access the 10.0.0.0 network, because will not have the 10.0.0.0 network in its routing table. With ACL 10 RTB permits routing updates to be sent to RTC for network 192.168.10.0/24 and because of the implicit deny rule at the end of any ACL, update for 10.0.0.0/8 network will not be allowed by the ACL.
QUESTION 266
Which two statements best describe CBWFQ? (Choose two.)
A. The CBWFQ scheduler provides a guaranteed minimum amount of bandwidth to each class.
B. CBWFQ services each class queue using a strict priority scheduler.
C. The class-default queue only supports WFQ.
D. Inside a class queue, processing is always FIFO, except for the class-default queue.
Answer: AD
QUESTION 267
Which statement is true of a source that wants to transmit multicast traffic to group 239.1.1.1?
A. Before sending traffic, it must first join multicast group 239.1.1.1 by sending an IGMPv2
membership report to the default router on the local subnet.
B. It must send an IGMPv2 Request to Send packet and then wait for an IGMPv2 Clear to Send
packet from the IGMPv2 querier router on the local subnet
C. It may begin transmitting multicast traffic to the group only when there is no other host transmitting
to the group on the local subnet.
D. It may transmit multicast traffic to the group at any time.
Answer: D
Explanation:
IP multicast is a method of sending Internet Protocol (IP) datagrams to a group of interested receivers in a single transmission. It is often employed for streaming media applications on the Internet and private networks.
The method is the IP-specific version of the general concept of multicast networking. It uses specially reserved multicast address blocks in IPv4 and IPv6. In IPv6, IP multicast addressing replaces broadcast addressing as implemented in IPv4.
Key concepts in IP multicast include an IP multicast group address,[3] a multicast distribution tree and receiver driven tree creation.[4]
An IP multicast group address is used by sources and the receivers to send and receive multicast messages. Sources use the group address as the IP destination address in their data packets. Receivers use this group address to inform the network that they are interested in receiving packets sent to that group. For example, if some content is associated with group 239.1.1.1, the source will send data packets destined to 239.1.1.1. Receivers for that content will inform the network that they are interested in receiving data packets sent to the group 239.1.1.1. The receiver joins 239.1.1.1. The protocol typically used by receivers to join a group is called the Internet Group Management Protocol (IGMP).
With routing protocols based on shared trees, once the receivers join a particular IP multicast group, a multicast distribution tree is constructed for that group. The protocol most widely used for this is Protocol Independent Multicast (PIM). It sets up multicast distribution trees such that data packets from senders to a multicast group reach all receivers which have joined the group. For example, all data packets sent to the group 239.1.1.1 are received by receivers who joined 239.1.1.1. There are variations of PIM implementations: Sparse Mode (SM), Dense Mode (DM), Source Specific Mode (SSM) and Bidirectional Mode (Bidir, or Sparse-Dense Mode, SDM). Of these, PIM-SM is the most widely deployed as of 2006; SSM and Bidir are simpler and scalable variations developed more recently and are gaining in popularity.
http://en.wikipedia.org/wiki/IP_multicast
QUESTION 268
Based on the exhibit presented. What will be the objective of this route map when applied to traffic passing through a router?
A. Take any packet sourced from any address in the 10.2.0.0/16 network or destined to 10.1.14.25
and set the next hop to 10.1.1.1
B. Take any packet sourced from any address in the 10.2.0.0/16 network and destined to 10.1.14.25
and set the next hop to 10.1.1.1
C. Nothing; extended access lists are not allowed in route maps used for policy-based routing
D. Drop any packet sourced from 10.2.0.0/16
Answer: A
Explanation:
In this configuration example, any traffic matching access list 100 will have their next hop set to 10.1.1.1 overriding the normal behavior of the routing table. Access list 100 has two entries, so any traffic matching either will be policy routed.
QUESTION 269
Which configuration is used to enable root guard?
A. interface gig3/1
spanning-tree guard root
B. interface gig3/1
spanning-tree root guard
C. interface gig3/1
spanning-tree root-guard
D. interface gig3/1
spanning-tree root-guard default
Answer: A
Explanation:
http://www.cisco.com/en/US/tech/tk389/tk621/technologies_tech_note09186a0080094640.shtml
QUESTION 270
Which two statements best describe spanning-tree BPDU processing for a blocking port? (Choose two.)
A. BPDUs that enter a blocking port are discarded.
B. BPDUs that enter a blocking port are processed.
C. Loopguard puts an interface into a loop-inconsistent state when BPDUs stop being received on a
blocking port.
D. BPDUs are only processed on forwarding ports.
Answer: BC
Explanation:
http://www.infraworld.eu/spanning-tree-root-guard-and-loop-guard/
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