Learn About Cisco Exam 642-892: CCNP Composite

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The following are questions from MeasureUp Practice Test for the Cisco exam 642-892: CCNP Composite

The audience for this exam includes individuals who are responsible for implementing multilayer switched networks and for configuring Cisco ISR routers to ensure the LANs and WANs to which they are connected are scalable. Experience with configuring, supporting and securing routing protocols, VLANs, IP multicasting, IPv6, wireless clients and voice networks will help you prepare for this exam.

Objective: Implement multicast forwarding.
Sub-objective: Describe, configure or verify IP multicast routing (e.g., PIM Sparse-Dense Mode).

Single answer, multiple-choice

Which command should you use so the router sends an auto-RP message to the 224.0.1.39 address announcing that it is a candidate rendezvous point?

A.    ip pim send-rp-discovery
B.    ip pim send-rp-announce
C.    ip pim spt-threshold
D.    ip pim sparse-mode
 
Answer:
B

Tutorial:
The ip pim send-rp-announce global configuration command is used on a router, so it sends an auto-RP message to 224.0.1.39 announcing it is a candidate RP for the group.

The ip pim send-rp-discovery global configuration command configures a router as an RP mapping agent.

The ip pim spt-threshold global configuration command controls when the Protocol Independent Multicast (PIM) leaf router will switch over from the shared tree to the source tree in sparse mode.

The ip pim sparse-mode interface configuration command enables PIM-SM (sparse mode) operation on an interface.

References:
Implementing IP Multicast
Cisco Press Authorized Self-Study Guide: Building Scalable Cisco Internetworks (BSCI), Third Edition
Chapter 9

Cisco IOS IP Configuration Guide, Release 12.2 – Configuring Bidirectional PIM
Cisco.com

http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfbipim.html#wp998638

Objective: Implement VLANs.
Sub-objective: Explain and configure VTP.

Single answer, multiple-choice

You implemented virtual local area networks (VLANs) in your company's network and are using the VLAN trunking protocol (VTP). Switch A is the VTP server in the network and has a configuration revision number of 100.

One of the junior network administrators has just taken a course about Cisco switches and has been trying out his new skills in your lab, using a new switch that arrived a few days ago. He initially copied the configuration from the VTP server switch and has renamed the switch to Switch B. He has been doing a lot of experimenting with VLANs and VTP. The configuration revision number on Switch B is 117.

He installs the switch in the company network. Which statement best describes what will happen?

A.    The configuration revision number on all switches in the network becomes 117, and all of the other switches in the network overwrite their VLAN configurations with the information from Switch B.
B.    Switch B overwrites its VLAN configuration with the information from Switch A.
C.    All of the switches, including Switch A and Switch B, keep their current VLAN configuration.
D.    All VLAN information in all switches is deleted, and the configuration revision number in all switches changes to its default of 0.
E.    The configuration revision number on all switches in the network becomes 117, but their VLAN configuration does not change.

Answer:
A

Tutorial:
The configuration revision number on all switches in the network becomes 117, and all of the other switches in the network overwrite their VLAN configurations with the information from Switch B.

Adding a new switch to a network that is using VTP can result in major network problems if it is not handled correctly. For example, any VLANs that existed on Switch A but no longer exist on Switch B will be deleted in all of the switches in the VTP domain. Also, all ports in these deleted VLANs will not function.

Reference:
Implementing and Configuring VLANs
Cisco Press Authorized Self-Study Guide: Building Cisco Multilayer Switched Networks (BCMSN), Fourth Edition
Chapter 4

Objective: Implement IPv6.
Sub-objective: Describe IPv6 addressing operations.

Single answer, multiple-choice

Which IPv6 multicast address would be used to reach "all routers" on a link?

A.    FF02::1
B.    FF02::9
C.    FF02::1:FF::FF
D.    FF05::101
E.    FF02::2

Answer:
E

Tutorial:
FF02::2 is the multicast address used to reach "all routers" on a link.

FF02::1 is the multicast address used to reach "all nodes" on a link.

FF02::9 is the multicast address used to reach "all Routing Information Protocol (RIP) routers" on a link. This address will reach only RIP routers, not all routers.

FF02::1:FF::FF is an invalid format. IPv6 can not have two sets of “::” in the same address.

FF05::101 is the address used to reach "all Network Time Protocol (NTP)" servers in the site.

References:
Implementing IPv6
Cisco Press Authorized Self-Study Guide: Building Scalable Cisco Internetworks (BSCI), Third Edition
Chapter 10

RFC 4291: IP Version 6 Addressing Architecture
IETF.org

http://www.ietf.org/rfc/rfc4291.txt

Objective: Implement Inter-VLAN routing.
Sub-objective: Explain and enable CEF operation.

Single answer, multiple-choice

A switch is using Cisco Express Forwarding (CEF). It has a glean adjacency for the 172.16.1.0/24 subnet. There are no entries in the adjacency table for other addresses on this subnet. What happens when a packet arrives destined for 172.16.1.4?

A.    The switch drops the packet.
B.    The switch forwards the packet to interface null0.
C.    The switch redirects the packet to the layer 3 engine.
D.    The switch holds the packet until the adjacency table is updated with an appropriate entry.

Answer:
C

Tutorial:
The glean adjacency in the adjacency table indicates the switch itself has a directly connected interface on that subnet and can therefore handle packets destined for currently attached hosts for which there is no layer 2 information. The switch redirects such packets to the layer 3 engine because it knows that it is directly connected to the same subnet as the destination device.

Thus, in the scenario, when a packet destined for 172.16.1.4 arrives at the switch, the switch redirects the packet to the layer 3 engine. The layer 3 engine will send an Address Resolution Protocol (ARP) request. When the ARP response is received, the switch populates the adjacency table so subsequent packets to the same destination address will be forwarded appropriately.

Reference:
Understanding and Configuring Multilayer Switching
Cisco Press Authorized Self-Study Guide: Building Cisco Multilayer Switched Networks (BCMSN), Fourth Edition
Chapter 9

Objective: Implement gateway redundancy technologies.
Sub-objective: Explain the functions and operations of gateway redundancy protocols (e.g., HSRP, VRRP and GLBP).

Multiple answer, multiple-choice

Cisco Internetwork Operating System (IOS) routers support the Virtual Router Redundancy Protocol (VRRP). Which Internet Protocol (IP) address and protocol number does VRRP use? (Choose two answers.)

A.    IP address 224.0.0.18
B.    Protocol number 112
C.    IP address 224.0.0.5
D.    Protocol number 41
E.    IP address 224.0.0.6
F.    Protocol number 6
G.    Protocol number 103
H.    IP address 224.0.0.10

Answers:
A, B

Tutorial:
VRRP uses IP multicast address 224.0.0.18 and protocol number 112.

IP multicast address 224.0.0.5 is for all Open Shortest Path First (OSPF) routers.

IP multicast address 224.0.0.6 is for all OSPF designated routers (DRs).

IP multicast address 224.0.0.10 is for Enhanced Interior Gateway Routing Protocol (EIGRP) routers.

Protocol number 41 is for Internet Protocol version 6 (IPv6).

Protocol number 6 is for Transmission Control Protocol (TCP).

Protocol number 103 is for Protocol Independent Multicast.

References:
Design Network Resiliency, Redundancy, and High Availability in Multilayer Switched Networks
Cisco Press Authorized Self-Study Guide: Building Cisco Multilayer Switched Networks (BCMSN), Fourth Edition
Chapter 12

Configuring VRRP
Cisco.com
http://www.cisco.com/en/US/docs/ios/ipapp/configuration/guide/ipapp_vrrp.html

Protocol Numbers
iana.org
http://www.iana.org/assignments/protocol-numbers

Internet Multicast Addresses
iana.org
http://www.iana.org/assignments/multicast-addresses

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