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QUESTION 181

Refer to the exhibit.

Which command is configured on this router?

A. bgp update-delay 60

B. neighbor 10.100.1.1 maximum-prefix 200

C. neighbor 10.100.1.1 maximum-path 2

D. neighbor 10.100.1.1 ebgp-multihop 2

Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The BGP Maximum-Prefix feature allows you to control how many prefixes can be received from a neighbor. By default, this feature allows a router to bring down

a peer when the number of received prefixes from that peer exceeds the configured Maximum-Prefix limit. This feature is commonly used for external BGP peers,

but can be applied to internal BGP peers also. When the maximum number of prefixes has been received, the BGP sessions closes into the IDLE state.

Reference. http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/25160-bgp- maximum-prefix.html

QUESTION 182

Refer to the exhibit.

Why is network 172.16.1.0/24 not installed in the routing table?

A. There is no ARP entry for 192.168.1.1.

B. The router cannot ping 192.168.1.1.

C. The neighbor 192.168.1.1 just timed out and BGP will flush this prefix the next time that the BGP scanner runs.

D. There is no route for 192.168.1.1 in the routing table.

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Here we see that the next hop IP address to reach the 172.16.1.0 network advertised by the BGP peer is 192.168.1.1. However, the 192.168.1.1 IP is not in the

routing table of R3 so it adds the route to the BGP table but marks it as inaccessible, as shown.

QUESTION 183

Refer to the exhibit.

Which two statements are true? (Choose two.)A. This is the output of the show ip ospf command.

B. This is the output of the show ip protocols command.

C. This router is an ABR.

D. This router is an ASBR.

E. Authentication is not configured for the area.

Correct Answer: AE

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The following is sample output from the show ip ospf command when entered without a specific OSPF process ID with no authentication

Router# show ip ospf

Routing Process "ospf 201" with ID 10.0.0.1 and Domain ID 10.20.0.1 Supports only single TOS(TOS0) routes

Supports opaque LSA

SPF schedule delay 5 secs, Hold time between two SPFs 10 secs Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs

LSA group pacing timer 100 secs

Interface flood pacing timer 55 msecs

Retransmission pacing timer 100 msecs

Number of external LSA 0. Checksum Sum 0x0

Number of opaque AS LSA 0. Checksum Sum 0x0

Number of DCbitless external and opaque AS LSA 0

Number of DoNotAge external and opaque AS LSA 0

Number of areas in this router is 2. 2 normal 0 stub 0 nssa External flood list length 0

Area BACKBONE(0)

Number of interfaces in this area is 2

Area has no authentication

SPF algorithm executed 4 times

Area ranges are

Number of LSA 4. Checksum Sum 0x29BEB

Number of opaque link LSA 0. Checksum Sum 0x0

Number of DCbitless LSA 3

Number of indication LSA 0

Number of DoNotAge LSA 0

Flood list length 0Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/command/iro-cr- book/ospf-s1.html#wp8749965360

QUESTION 184

Consider a network that mixes link bandwidths from 128 kb/s to 40 Gb/s. Which value should be set for the OSPF reference bandwidth?

A. Set a value of 128.

B. Set a value of 40000.

C. Set a manual OSPF cost on each interface.

D. Use the default value.

E. Set a value of 40000000.

F. Set a value of 65535.

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Unlike the metric in RIP which is determined by hop count and EIGRP’s crazy mathematical formulated metric, OSPF is a little more simple. The default formula to

calculate the cost for the OSPF metric is (10^8/BW).

By default the metrics reference cost is 100Mbps, so any link that is 100Mbps will have a metric of

1. a T1 interface will have a metric of 64 so in this case if a router is trying to get to a FastEthernet network on a router that is through a T1 the metric would be 65

(64 +1). You do however have the ability to statically specify a metric on a per interface basis by using the ip ospf cost # where the cost is an integer between 1-

65535.

So the big question is why would you want to statically configure a metric?

The biggest advantage of statically configuring an OSPF metric on an interface is to manipulate which route will be chosen dynamically via OSPF. In a nut shell it’s

like statically configuring a dynamic protocol to use a specific route. It should also be used when the interface bandwidths vary greatly (some very low bandwidth

interfaces and some very high speed interfaces on the same router).

QUESTION 185

Which statement about a type 4 LSA in OSPF is true?

A. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ASBR.

B. It is an LSA that is originated by an ASBR, that is flooded throughout the AS, and that describes a route to the ASBR.

C. It is an LSA that is originated by an ASBR, that is flooded throughout the area, and that describes a route to the ASBR.

D. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ABR.

E. It is an LSA that is originated by an ABR, that is flooded throughout the area, and that describes a route to the ASBR.

Correct Answer: ESection: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

LSA Type 4 (called Summary ASBR LSA) is generated by the ABR to describe an ASBR to routers in other areas so that routers in other areas know how to get to

external routes through that ASBR.

QUESTION 186

Refer to the exhibit.

Why is the prefix 1.1.1.1/32 not present in the routing table of R1?

A. There is a duplicate router ID.

B. There is a subnet mask mismatch on Ethernet0/0.

C. The router LSA has an invalid checksum.

D. There is an OSPF network type mismatch that causes the advertising router to be unreachable.

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

A common problem when using Open Shortest Path First (OSPF) is routes in the database don’t appear in the routing table. In most cases OSPF finds a

discrepancy in the database so it doesn’t install the route in the routing table. Often, you can see the Adv Router is not-reachable message (which means that the

router advertising the LSA is not reachable through OSPF) on top of the link-state advertisement (LSA) in the database when this problem occurs. Here is an

example:

Adv Router is not-reachable

LS agE. 418

Options: (No TOS-capability, DC)

LS TypE. Router Links

Link State ID. 172.16.32.2

Advertising Router: 172.16.32.2

LS Seq Number: 80000002

Checksum: 0xFA63

Length: 60

Number of Links: 3

There are several reasons for this problem, most of which deal with mis-configuration or a broken topology. When the configuration is corrected the OSPF

database discrepancy goes away and the routes appear in the routing table.

Reason 1: Network Type Mismatch

Let’s use the following network diagram as an example:

R4-4K(4)# show ip ospf interface serial 2

Serial2 is up, line protocol is up

Internet Address 172.16.32.1/24, Area 0

Process ID 20, Router ID 172.16.33.1, Network Type BROADCAST, Cost: 64

Transmit Delay is 1 sec, State DR, Priority 1

Designated Router (ID) 172.16.33.1, Interface address 172.16.32.1

Backup Designated router (ID) 172.16.32.2, Interface address 172.16.32.2

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

Hello due in 00:00:08

Neighbor Count is 1, Adjacent neighbor count is 1

Adjacent with neighbor 172.16.32.2 (Backup Designated Router)

Suppress hello for 0 neighbor(s)

R1-7010(5)# show ip ospf interface serial 1/0

Serial1/0 is up, line protocol is up

Internet Address 172.16.32.2/24, Area 0

Process ID 20, Router ID 172.16.32.2, Network Type POINT_TO_POINT, Cost: 64

Transmit Delay is 1 sec, State POINT_TO_POINT,

Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5

Hello due in 00:00:02

Neighbor Count is 1, Adjacent neighbor count is 1

Adjacent with neighbor 172.16.33.1

Suppress hello for 0 neighbor(s)

As you can see above, Router R4-4K is configured for broadcast, and Router R1-7010 is configured for point-to-point. This kind of network type mismatch makes

the advertising router unreachable.

R4-4K(4)# show ip ospf database router 172.16.32.2Adv Router is not-reachable

LS agE. 418

Options: (No TOS-capability, DC)

LS TypE. Router Links

Link State ID. 172.16.32.2

Advertising Router: 172.16.32.2

LS Seq Number: 80000002

Checksum: 0xFA63

Length: 60

Number of Links: 3

Link connected to: another Router (point-to-point)

(Link ID) Neighboring Router ID. 172.16.33.1

(Link Data) Router Interface address: 172.16.32.2

Number of TOS metrics: 0

TOS 0 Metrics: 64

Link connected to: a Stub Network

(Link ID) Network/subnet number: 172.16.32.0

(Link Data) Network Mask: 255.255.255.0

Number of TOS metrics: 0

TOS 0 Metrics: 64

R1-7010(5)# show ip ospf database router 172.16.33.1

Adv Router is not-reachable

LS agE. 357

Options: (No TOS-capability, DC)

LS TypE. Router Links

Link State ID. 172.16.33.1

Advertising Router: 172.16.33.1

LS Seq Number: 8000000A

Checksum: 0xD4AA

Length: 48

Number of Links: 2

Link connected to: a Transit Network

(Link ID) Designated Router address: 172.16.32.1

(Link Data) Router Interface address: 172.16.32.1

Number of TOS metrics: 0

TOS 0 Metrics: 64You can see that for subnet 172.16.32.0/24, Router R1-7010 is generating a point-to-point link and Router R4-4K is generating a transit link. This creates a

discrepancy in the link-state database, which means no routes are installed in the routing table.

R1-7010(5)# show ip route

172.16.0.0/16 is variably subnetted, 3 subnets, 2 masks

C 172.16.32.0/24 is directly connected, Serial1/0

C 172.16.30.1/32 is directly connected, Loopback0

Solution

To solve this problem, configure both routers for the same network type. You can either change the network type of Router R1-7010 to broadcast, or change

Router R4-4K’s serial interface to point-to- point.

Reference. http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7112- 26.html

QUESTION 187

Which authentication method does OSPFv3 use to secure communication between neighbors?

A. plaintext

B. MD5 HMAC

C. PKI

D. IPSec

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

In order to ensure that OSPFv3 packets are not altered and re-sent to the device, causing the device to behave in a way not desired by its system administrators,

OSPFv3 packets must be authenticated. OSPFv3 uses the IPsec secure socket API to add authentication to OSPFv3 packets. This API supports IPv6.

OSPFv3 requires the use of IPsec to enable authentication. Crypto images are required to use authentication, because only crypto images include the IPsec API

needed for use with OSPFv3.

Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro- 15-sy-book/ip6-route-ospfv3-auth-ipsec.html

QUESTION 188

Which three statements are true about OSPFv3? (Choose three.)

A. The only method to enable OSPFv3 on an interface is via the interface configuration mode.B. Multiple instances of OSPFv3 can be enabled on a single link.

C. There are two methods to enable OSPFv3 on an interface, either via the interface configuration mode or via the router configuration mode.

D. For OSPFv3 to function, IPv6 unicast routing must be enabled.

E. For OSPFv3 to function, IPv6 must be enabled on the interface.

F. Only one instance of OSPFv3 can be enabled on a single link.

Correct Answer: BDE

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Here is a list of the differences between OSPFv2 and OSPFv3:

They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols (more on this following))

OSPFv3 introduces new LSA types

OSPFv3 has different packet format

OSPFv3 uses different flooding scope bits (U/S2/S1)

OSPFv3 adjacencies are formed over link-local IPv6 communications OSPFv3 runs per-link rather than per-subnet

OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses

OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs) OSPFv3 Neighbor Authentication done with IPsec (AH)

OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number

Following is a simple example of OSPFv3 configuration on a Cisco IOS 12.4T router.

ipv6 unicast-routing

ipv6 cef

!

interface GigabitEthernet 0/0

description Area 0.0.0.0 backbone interface

ipv6 address 2001:DB8:100:1::1/64

ipv6 ospf network broadcast

ipv6 ospf 100 area 0.0.0.0

Reference. http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and- ipv6.html

QUESTION 189

Which statement about OSPF multiaccess segments is true?

A. The designated router is elected first.

B. The designated and backup designated routers are elected at the same time.C. The router that sent the first hello message is elected first.

D. The backup designated router is elected first.

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

According to the RFC, the BDR is actually elected first, followed by the DR. The RFC explains why:

"The reason behind the election algorithm’s complexity is the desire for an orderly transition from Backup Designated Router to Designated Router, when the

current Designated Router fails. This orderly transition is ensured through the introduction of hysteresis: no new Backup Designated Router can be chosen until

the old Backup accepts its new Designated Router responsibilities.

The above procedure may elect the same router to be both Designated Router and Backup Designated Router, although that router will never be the calculating

router (Router X) itself."

Reference. http://www.ietf.org/rfc/rfc2328.txt Page 76

QUESTION 190

What are the minimal configuration steps that are required to configure EIGRP HMAC-SHA2 authentication?

A. classic router mode, interface XX, authentication mode hmac-sha-256 <password>

B. named router mode, address-family statement, authentication mode hmac-sha-256 <password>

C. named router mode, address-family statement, af-interface default, authentication mode hmac- sha-256 <password>

D. named router mode, address-family statement, authentication mode hmac-sha-256 <password>

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The example below shows how to configure EIGRP HMAC-SHA2 on Cisco router:

Device(config)# router eigrp name1

Device(config-router)# address-family ipv4 autonomous-system 45000

Device(config-router-af)# af-interface ethernet 0/0

Device(config-router-af-interface)# authentication mode hmac-sha-256 0 password1

Device(config-router-af-interface)# end

Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-sy/ire- 15-sy-book/ire-sha-256.htmlQUESTION 191

Refer to the exhibit.

How many EIGRP routes will appear in the routing table of R2?

A. 0

B. 1

C. 2

D. 3

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

EIGRPv6 on R2 was shut down so there is no EIGRP routes on the routing table of R2. If we turn on EIGRPv6 on R2 (with "no shutdown" command) then we

would see the prefix of the loopback interface of R1 in the routing table of R2.

Note. EIGRPv6 requires the "ipv6 unicast-routing" global command to be turned on first or it will not work.

QUESTION 192

Which two configuration changes should be made on the OTP interface of an EIGRP OTP route reflector? (Choose two.)A. passive-interface

B. no split-horizon

C. no next-hop-self

D. hello-interval 60, hold-time 180

Correct Answer: BC

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

The EIGRP Over the Top feature enables a single end-to-end Enhanced Interior Gateway Routing Protocol (EIGRP) routing domain that is transparent to the

underlying public or private WAN transport that is used for connecting disparate EIGRP customer sites. When an enterprise extends its connectivity across

multiple sites through a private or a public WAN connection, the service provider mandates that the enterprise use an additional routing protocol, typically the

Border Gateway Protocol (BGP), over the WAN links to ensure end-to-end routing. The use of an additional protocol causes additional complexities for the

enterprise, such as additional routing processes and sustained interaction between EIGRP and the routing protocol to ensure connectivity, for the enterprise. With

the EIGRP Over the Top feature, routing is consolidated into a single protocol (EIGRP) across the WAN.

Perform this task to configure a customer edge (CE) device in a network to function as an EIGRP Route Reflector:

1. enable

2. configure terminal

3. router eigrp virtual-name

4. address-family ipv4 unicast autonomous-system as-number

5. af-interface interface-type interface-number

6. no next-hop-self

7. no split-horizon

8. exit

9. remote-neighbors source interface-type interface-number unicast-listen lisp-encap

10. network ip-address

11. end

Note. Use no next-hop-self to instruct EIGRP to use the received next hop and not the local outbound interface address as the next hop to be advertised to

neighboring devices. If no next-hop- self is not configured, the data traffic will flow through the EIGRP Route Reflector.

Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-3s/ire- xe-3s-book/ire-eigrp-over-the-top.html

QUESTION 193

Which statement about the function of poison reverse in EIGRP is true?

A. It tells peers to remove paths that previously might have pointed to this router.B. It tells peers to remove paths to save memory and bandwidth.

C. It provides reverse path information for multicast routing.

D. It tells peers that a prefix is no longer reachable.

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Poison Reverse in EIGRP states: "Once you learn of a route through an interface, advertise it as unreachable back through that same interface". For more

information please read here. http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol- eigrp/16406-eigrp-toc.html#splithorizon.

QUESTION 194

What is the preferred method to improve neighbor loss detection in EIGRP?

A. EIGRP natively detects neighbor down immediately, and no additional feature or configuration is required.

B. BFD should be used on interfaces that support it for rapid neighbor loss detection.

C. Fast hellos (subsecond) are preferred for EIGRP, so that it learns rapidly through its own mechanisms.

D. Fast hellos (one-second hellos) are preferred for EIGRP, so that it learns rapidly through its own mechanisms.

Correct Answer: B

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Bi-directional Forwarding Detection (BFD) provides rapid failure detection times between forwarding engines, while maintaining low overhead. It also provides a

single, standardized method of link/device/protocol failure detection at any protocol layer and over any media.

Reference. "Bidirectional Forwarding Detection for EIGRP"

http://www.cisco.com/en/US/technologies/tk648/tk365/tk207/technologies_white_paper0900aecd8 0243fe7.html

QUESTION 195

How does EIGRP derive the metric for manual summary routes?

A. It uses the best composite metric of any component route in the topology table.

B. It uses the worst composite metric of any component route in the topology table.

C. It uses the best metric vectors of all component routes in the topology table.D. It uses the worst metric vectors of all component routes in the topology table.

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

For example if your router has a routing table like this:

Now suppose you want to manually summarize all the routes above, you can use this command (on the router that advertised these routes to our router):

Router(config-if)#ip summary-address eigrp 1 192.168.8.0 255.255.248.0

After that the routing table of your router will look like this:

D 192.168.8.0/21 [90/2195456] via 192.168.0.1, 00:01:42, Serial0/0

And we can see the manual summary route takes the smallest metric of the specific routes.

QUESTION 196

Refer to the exhibit.

Which part of the joined group addresses list indicates that the interface has joined the EIGRP multicast group address?

A. FF02::1

B. FF02::1:FF00:200

C. FF02::A

D. FF02::2

Correct Answer: C

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

FF02::A is an IPv6 link-local scope multicast addresses. This address is for all devices on a wire that want to "talk" EIGRP with one another.

Focusing specifically on FF02::A and how routers join it, we can see and say three things:

Local: FF02::A is local to the wire.

Join: Each device "joins" FF02::A by just "deciding to listen" to the IPv6 link-local scope multicast address FF02::A. Then, by extension, it listens to the

corresponding MAC address for that multicast IPv6 address (33:33:00:00:00:0A).

Common interest: As we can see, these varying groups have something in common that they would all like to hear about. For FF02::A, the common interest —

the "connection" among the devices joining that group is that they all want to listen to or participate in EIGRP.

Reference. http://www.networkcomputing.com/networking/understanding-ipv6-what-is-solicited- node-multicast/a/d-id/1315703

QUESTION 197

EIGRP allows configuration of multiple MD5 keys for packet authentication to support easy rollover from an old key to a new key. Which two statements are true

regarding the usage of multiple authentication keys? (Choose two.)A. Received packets are authenticated by the key with the smallest key ID.

B. Sent packets are authenticated by all valid keys, which means that each packet is replicated as many times as the number of existing valid keys.

C. Received packets are authenticated by any valid key that is chosen.

D. Sent packets are authenticated by the key with the smallest key ID.

Correct Answer: CD

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Suppose two routers are connected with each other via Fa0/0 interfaces and they are configured to authenticate via MD5. Below is a simple configuration on both

routers so that they will work:

Router1(config)#key chain KeyChainR1

Router1(config-keychain)#key 1

Router1(config-keychain-key)#key-string FirstKey

Router1(config-keychain-key)#key 2

Router1(config-keychain-key)#key-string SecondKey

Router2(config)#key chain KeyChainR2

Router2(config-keychain)#key 1

Router2(config-keychain-key)#key-string FirstKey

Router2(config-keychain-key)#key 2

Router2(config-keychain-key)#key-string SecondKey

Apply these key chains to R1 & R2:

Router1(config)#interface fastEthernet 0/0

Router1(config-if)#ip authentication mode eigrp 1 md5

Router1(config-if)#ip authentication key-chain eigrp 1 KeyChainR1 Router2(config)#interface fastEthernet 0/0

Router2(config-if)#ip authentication mode eigrp 1 md5

Router2(config-if)#ip authentication key-chain eigrp 1 KeyChainR2

There are some rules to configure MD5 authentication with EIGRP:

+ The key chain names on two routers do not have to match (in this case the name "KeyChainR1 & "KeyChainR2 do not match)

+ The key number and key-string on the two potential neighbors must match (for example "key 1 & "key-string FirstKey" must match on "key 1" & "key-string

FirstKey" of neighboring router) Also some facts about MD5 authentication with EIGRP

+ When sending EIGRP messages the lowest valid key number is used -> D is correct.

+ When receving EIGRP messages all currently configured valid keys are verified but the lowest valid one will be used -> Although answer C does not totally

mention like that but it is the most suitable answer because A and B are totally wrong.Answer A is not correct because we need valid key to authenticate. As mentioned above, although answer C is not totally correct but it puts some light on why

answer B is not correct: each packet is NOT "replicated as many times as the number of existing valid keys". All currently configured valid keys are verified but the

lowest valid one will be used.

QUESTION 198

Refer to the exhibit.

Which additional configuration is necessary for R1 and R2 to become OSPF neighbors?

A. R1

!

router ospf 1

no passive-interface Fastethernet0/0

!

B. R2

!

router ospf 10

no network 10.1.1.6 0.0.0.0 area 0

network 10.1.1.6 0.0.0.0 area 1

!C. R1

!

interface FastEthernet0/0

ip ospf mtu-ignore

!

R2

!

interface FastEthernet0/1

ip ospf mtu-ignore

!

D. R1

!

no router ospf 1

router ospf 10

network 10.1.1.5 0.0.0.0 area 0

Correct Answer: A

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:

Because the passive interface default command is used, by default all interfaces are passive and no neighbors will form on these interfaces. We need to disable

passive interface on the link to R2 by using the "no passive-interface Fastethernet0/0" on R1 under OSPF.

QUESTION 199

Consider an OSPFv3 network with four parallel links between each pair of routers. Which measure can you use to reduce the CPU load and at the same time keep

all links available for ECMP?

A. Configure some interfaces as passive interface.

B. Configure ipv6 ospf priority 0 on some interfaces.

C. Configure some routers with a distribute list in ingress of the OSPFv3 process.

D. Configure ipv6 ospf database-filter all out on some interfaces.

Correct Answer: D

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

Explanation:To filter outgoing link-state advertisements (LSAs) to an Open Shortest Path First version 3 (OSPFv3) interface, use the ipv6 ospf database-filter all out command

in interface configuration mode. This can be done on some of the links to reduce the CPU load while still ensuring that all links in the equal cost path are still being

used.

QUESTION 200

Refer to the exhibit.

Which two statements about the device that generated the output are true? (Choose two.)

A. The SPT-bit is set.

B. The sparse-mode flag is set.

C. The RP-bit is set.

D. The source-specific host report was received.

Correct Answer: AD

Section: Layer 3 Technologies

Explanation

Explanation/Reference:

In this example we can see that the s, T, and I flags are set. Here is a list of the flags and their meanings:

show ip mroute Field Descriptions

Reference. http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/12s_ssm.html

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