Download New Updated (July) Cisco 400-101 Actual Test 151-160

Ensurepass

 

 

QUESTION 151

What is the purpose of EIGRP summary leaking?

 

A.

to allow a summary to be advertised conditionally on specific criteria

B.

to allow a component of a summary to be advertised in addition to the summary

C.

to allow overlapping summaries to exist on a single interface

D.

to modify the metric of the summary based on which components of the summary are operational

 

Correct Answer: B

Explanation:

When you do manual summarization, and still you want to advertise some specific routes to the neighbor, you can do that using leak-map. Please read more about leaking routes here.

http://www.cisco.com/c/en/us/td/docs/ios/iproute_eigrp/command/reference/ire_book/ire_i1.html#w p1037685.

 

 

QUESTION 152

Refer to the exhibit. You have just created a new VRF on PE3. You have enabled debug ip bgp vpnv4 unicast updates on PE1, and you can see the route in the debug, but not in the BGP VPNv4 table. Which two statements are true? (Choose two.)

 

clip_image002

 

A.

VPNv4 is not configured between PE1 and PE3.

B.

address-family ipv4 vrf is not configured on PE3.

C.

After you configure route-target import 999:999 for a VRF on PE3, the route will be accepted.

D.

PE1 will reject the route due to automatic route filtering.

E.

After you configure route-target import 999:999 for a VRF on PE1, the route will be accepted.

 

Correct Answer: DE

Explanation:

The route target extended community for VPLS auto-discovery defines the import and export policies that a VPLS instance uses. The export route target sets an extended community attribute number that is appended to all routes that are exported from the VPLS instance. The import route target value sets a filter that determines the routes that are accepted into the VPLS instance. Any route with a value in its import route target contained in its extended attributes field matching the value in the VPLS instance’s import route target are accepted. Otherwise the route is rejected.

 

 

QUESTION 153

Which two DHCP messages are always sent as broadcast? (Choose two.)

 

A.

DHCPOFFER

B.

DHCPDECLINE

C.

DHCPRELEASE

D.

DHCPREQUEST

E.

DHCPDISCOVER

 

Correct Answer: DE

Explanation:

DHCP discovery

The client broadcasts messages DHCPDISCOVER on the network subnet using the destination address 255.255.255.255 or the specific subnet broadcast address.

DHCP request

In response to the DHCP offer, the client replies with a DHCP request, broadcast to the server, requesting the offered address. A client can receive DHCP offers from multiple servers, but it will accept only one DHCP offer.

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

 

 

 

 

 

QUESTION 154

With which ISs will an ISIS Level 1 IS exchange routing information?

 

A.

Level 1 ISs

B.

Level 1 ISs in the same area

C.

Level 1 and Level 2 ISs

D.

Level 2 ISs

 

Correct Answer: B

Explanation:

IS-IS differs from OSPF in the way that “areas” are defined and routed between. IS-IS routers are designated as being: Level 1 (intra-area); Level 2 (inter area); or Level 1-2 (both). Level 2 routers are inter area routers that can only form relationships with other Level 2 routers. Routing information is exchanged between Level 1 routers and other Level 1 routers, and Level 2 routers only exchange information with other Level 2 routers. Level 1-2 routers exchange information with both levels and are used to connect the inter area routers with the intra area routers.

Reference: http://en.wikipedia.org/wiki/IS-IS

 

 

QUESTION 155

Refer to the exhibit. Why is the neighbor relationship between R1 & R2 and R1 & R3 an L2-type neighborship?

 

clip_image004

 

A.

because the area ID on R1 is different as compared to the area ID of R2 and R3

B.

because the circuit type on those three routers is L1/L2

C.

because the network type between R1, R2, and R3 is point-to-point

D.

because the hello interval is not the same on those three routers

 

Correct Answer: A

Explanation:

With IS-IS, an individual router is in only one area, and the border between areas is on the link that connects two routers that are in different areas. A Level 2 router may have neighbors in the same or in different areas, and it has a Level 2 link-state database with all information for inter-area routing. Level 2 routers know about other areas but will not have Level 1 information from its own area.

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml

QUESTION 156

Which three statements about the designated router election in IS-IS are true? (Choose three.)

 

A.

If the IS-IS DR fails, a new DR is elected.

B.

The IS-IS DR will preempt. If a new router with better priority is added, it just becomes active in the network.

C.

If there is a tie in DR priority, the router with a higher IP address wins.

D.

If there is a tie in DR priority, the router with a higher MAC address wins.

E.

If the DR fails, the BDR is promoted as the DR.

F.

The DR is optional in a point-to-point network.

 

Correct Answer: ABD

Explanation:

DR/DIS election

Setting priority to 0 doesn’t disable DIS election; use point-to-point to disable it.There can be separate DRs for L1 and L2 adjacencies.There is no backup DR. If the primary DR fails, a new DR is elected.DR preemption is enabled by default.

Reference: http://ccie-in-2-months.blogspot.com/2013/12/is-is-hints.html

 

 

QUESTION 157

Which three elements compose a network entity title? (Choose three.)

 

A.

area ID

B.

domain ID

C.

system ID

D.

NSAP selector

E.

MAC address

F.

IP address

 

Correct Answer: ACD

Explanation:

An IS (Intermediate system) is identified by an address known as a network access point (NASAP). The NSAP is divided up into three parts as specified by ISO/AI 10589:

Area address–This field is of variable length, composed of high order octets, and it excludes the System ID and N-selector (NSEL) fields. This area address is associated wit a single area within the routing domain.

System ID–This field is 6 octets long and should be set to a unique value with Level 1 and Level

The system IS defines an end system (ES) or an IS in an area. You configure the area address and the system ID with the NET command. You can display the system ID with the show isis topology command.

NSEL–This field is called the N-selector, also referred to as the NSAP, and it specifies the upper- layer protocol. The NSEL is the last byte of the NSAP and identifies a network service user. A network service user is a transport entity or the IS network entity itself. When the N-selector is set to zero, the entire NSAP is called a network entity title (NET).

A NET is an NSAP where the last byte is always the n-selector and is always zero. A NET can be from 8 to 20 bytes in length.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/iproute_isis/command/reference/irs_book/irs_is2.html

 

 

 

 

 

QUESTION 158

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

 

A.

IS-IS can be used only in the service provider network.

B.

IS-IS can be used to route both IP and CLNP.

C.

IS-IS has three different levels of authentication: interface level, process level, and domain level.

D.

IS-IS is an IETF standard.

E.

IS-IS has the capability to provide address summarization between areas.

 

Correct Answer: BCE

Explanation:

Intermediate System to Intermediate System (IS-IS) was designed as the routing protocol for ISO’s CLNP described in IS0 10589. IS-IS is a Link State routing protocol akin to OSPF and was developed by DEC for use with DECnet Phase V. It was originally thought that TCP/IP would gradually make way for the seven layer OSI architecture so an enhancement to IS-IS was developed called Integrated IS-IS also known as Dual IS-IS that could route both Connectionless- Mode Network Service (CLNS) as well as IP.

Cisco IOS supports IS-IS authentication on 3 different levels; between neighbors, area-wide, and domain-wide, where each can be used by themselves or together.

summary-address address mask {level-1 | level-1-2 | level-2} is used to configure IP address summarization.

References:

http://www.rhyshaden.com/isis.htm

http://mynetworkingwiki.com/index.php/Configuring_IS-IS

 

 

QUESTION 159

Which statement describes the function of the tracking object created by the track 10 ip route 192.168.99.0/24 reachability command?

 

A.

It tracks the reachability of route 192.168.99.0/24.

B.

It tracks the line protocol status of the interface on which route 192.168.99.0/24 is received.

C.

It tracks exactly 10 occurrences of route 192.168.99.0/24.

D.

It tracks the summary route 192.168.99.0/24 and all routes contained within.

 

Correct Answer: A

Explanation:

Command

Purpose

Step 1

configure terminal

Enter global configuration mode.

Step 2

track object-number {interface interface-id{line-protocol | ip routing} | ip route ip- address/prefix-length {metric threshold | reachability} | list {boolean {and | or}} | {threshold { weight | percentage}}}

(Optional) Create a tracking list to track the configured state and enter tracking configuration mode.

 

clip_image006The object-number range is from 1 to 500.

Enter interface interface-id to select an interface to track.

clip_image006[2]Enter line-protocol to track the interface line protocol state or enter ip routing to track the interface IP routing state.

clip_image006[3]Enter ip route ip-address/prefix-length to track the state of an IP route.

clip_image006[4]Enter metric threshold to track the threshold metric or enter reachability to track if the route is reachable.

clip_image006[5]The default up threshold is 254 and the default down threshold is 255.

clip_image006[6]Enter list to track objects grouped in a list. Configure the list as described on the previous pages.

 

Note

Repeat this step for each interface to be tracked.

 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12- 2_52_se/configuration/guide/3560scg/sweot.html

 

 

QUESTION 160

Which group of neighbors can be configured as a BGP peer group?

 

A.

a group of iBGP neighbors that have the same outbound route policies

B.

a group of iBGP and eBGP neighbors that have the same inbound distribute-list

C.

a group of eBGP neighbors in the same autonomous system that have different outbound route policies

D.

a group of iBGP neighbors that have different outbound route policies

 

Correct Answer: A

Explanation:

You can group BGP neighbors who share the same outbound policies together in what is called a BGP peer group. Instead of configuring each neighbor with the same policy individually, a peer group allows you to group the policies which can be applied to individual peers thus making efficient update calculation along with simplified configuration.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/13755-29.html

 

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