CCIE Routing and Switching Written Exam v5.1

 

QUESTION 481

Which three TLVs does LLDP use to discover network devices? (Choose three.)

 

A.

Management address

B.

Port description

C.

Network policy

D.

System name

E.

Location information

F.

Power management

 

Correct Answer: ABD

Explanation:

Basic Management TLV SetThis set includes the following five TLVs used in LLDP:

Port description TLV: Provides a description of the port in an alpha-numeric format. The value equals the ifDescr object, if the LAN device supports RFC 2863.

System name TLV: Provides the system’s assigned name in an alpha-numeric format. The value equals the sysName object, if the LAN device supports RFC 3418.

System description TLV: Provides a description of the network entity in an alphanumeric format. This includes system’s name and versions of hardware, operating system and networking software supported in the device. The value equals the sysDescr object, if the LAN device supports RFC 3418.

System capabilities TLV: Indicates the primary function(s) of the device and whether or not these functions are enabled in the device. The capabilities are indicated by two octects. Bits 0 through 7 indicate Other, Repeater, Bridge, WLAN AP, Router, Telephone, DOCSIS cable device and Station respectively. Bits 8 through 15 are reserved.

Management address TLV: Indicates the addresses of the local LLDP agent. Other remote managers can use this address to obtain information related to the local device.

 

Reference: http://www.eetimes.com/document.asp?doc_id=1272069

 

 

QUESTION 482

Which option is a core event publisher for EEM?

 

A.

Timer

B.

Policy Director

C.

Applet

D.

Script

 

Correct Answer: A

Explanation:

EEM is a flexible, policy-driven framework that supports in-box monitoring of different components of the system with the help of software agents known as event detectors. The figure below shows

the relationship between the EEM server, core event publishers (event detectors), and the event subscribers (policies). Basically, event publishers screen events and publish them when there is a

match on an event specification that is provided by the event subscriber. Event detectors notify the

EEM server when an event of interest occurs. The EEM policies that are configured using the Cisco command-line interface (CLI) then implement recovery on the basis of the current state of the system and the actions specified in the policy for the given event.

EEM offers the ability to monitor events and take informational or corrective action when the monitored events occur or when a threshold is reached. An EEM policy is an entity that defines an

event and the actions to be taken when that event occurs. There are two types of EEM policies: an applet or a script. An applet is a simple form of policy that is defined within the CLI configuration. A script is a form of policy that is written in Tool Command Language (Tcl).

Figure 1. Embedded Event Manager Core Event Detectors

 

clip_image002

 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/eem/configuration/15-mt/eem-15-mtbook/eem-overview.html

 

 

QUESTION 483

Which topology allows the split-horizon rule to be safely disabled when using EIGRP?

 

A.

full mesh

B.

partial mesh

C.

hub and spoke

D.

ring

 

Correct Answer: C

 

 

QUESTION 484

Which command enables L2 QoS support in all VLANs (including the native VLAN)?

 

A.

switchport priority extend cos

B.

mls qos trust dscp

C.

mls qos rewrite ip dscp

D.

switchport trunk native vlan tag

 

Correct Answer: D

Explanation:

You can enter the switchport trunk native vlan tag command to enable the tagging of native VLAN traffic on a per-port basis. When tagging is enabled, all the packets on the native VLAN are tagged and all incoming untagged data packets are dropped, but untagged control packets are accepted. When tagging is enabled, it will allow for L2 QoS support in all VLANs, including the native VLAN.

QUESTION 485

DRAG DROP

Drag and drop each IPv6 neighbor discovery message type on the left to the corresponding description on the right.

 

clip_image003

 

Correct Answer:

clip_image004

 

 

QUESTION 486

Refer to the exhibit. Which option is the result of this configuration?

 

clip_image006

 

A.

Devices in OSPF area 15 can reach the summary route 192.168.0.0/16 and its more specific subnets.

B.

Devices in OSPF area 15 can reach only the more specific routes of 192.168.0.0/16.

C.

Devices in OSPF area 0 can reach the summary route 192.168.0.0/16 and its more specific subnets.

D.

Devices in OSPF area 0 can reach only the summary route of 192.168.0.0/16.

 

Correct Answer: A

Explanation:

area range

To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode. To disable this function, use theno form of this command.

area area-id range ip-address mask [advertise | not-advertise] [cost cost]

no area area-id range ip-address mask [advertise | not-advertise] [cost cost]

Syntax Description

area-id

Identifier of the area about which routes are to be summarized. It can be specified as either a decimal value or as an IP address.

ip-address

IP address.

mask

IP address mask.

advertise

(Optional) Sets the address range status to advertise and generates a Type 3 summary link-state advertisement (LSA).

not-advertise

(Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks.

 

Reference:

http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf.html

 

 

QUESTION 487

DRAG DROP

Drag and drop the VLAN number on the left to the corresponding default VLAN name on the right.

 

clip_image007

 

Correct Answer:

clip_image008

 

 

QUESTION 488

Which two values are needed to configure NTP authentication? (Choose two.)

 

A.

the encryption method

B.

the key number

C.

the burst mode

D.

the key string

E.

the Diffie-Hellman group

 

Correct Answer: BD

 

 

QUESTION 489

Which two statements about the client-identifier in a DHCP pool are true? (Choose two.)

 

A.

It specifies a unique identifier that is used only for DHCP requests.

B.

It is specified by appending 01 to the MAC address of a DHCP client.

C.

It specifies a hardware address for the client.

D.

It specifies a unique identifier that is used only for BOOTP requests.

E.

It requires that you specify the hardware protocol.

 

Correct Answer: AB

Explanation:

client-identifier unique-identifier

Example:

Device(dhcp-config)# client-identifier 01b7.0813.8811.66

Specifies the unique identifier for DHCP clients.

This command is used for DHCP requests.

DHCP clients require client identifiers. You can specify the unique identifier for the client in either of the following ways:

A 7-byte dotted hexadecimal notation. For example, 01b7.0813.8811.66, where 01 represents the Ethernet media type and the remaining bytes represent the MAC address of the DHCP client.

A 27-byte dotted hexadecimal notation. For example,

7665.6e64.6f72.2d30.3032.342e.3937.6230.2e33.3734.312d.4661.302f.31. The equivalent ASCII string for this hexadecimal value is vendor-0024.97b0.3741-fa0/1, where vendor represents the vendor, 0024.97b0.3741 represents the MAC address of the source interface, and fa0/1 represents the source interface of the DHCP client.

See the Troubleshooting Tips section for information about how to determine the client identifier of the DHCP client.

Note:

The identifier specified here is considered for a DHCP client that sends a client identifier in the packet.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipaddr_dhcp/configuration/15-mt/dhcp-15-mt-book/config-dhcp-server.html

 

 

QUESTION 490

Which option is the default point of insertion for the BGP cost community?

 

A.

before best path calculation

B.

after best path calculation

C.

after the IGP metric comparison

D.

after the router ID comparison

 

Correct Answer: C

 

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