CH11 - OSPF, BGP, Route Manipulation, & IP Multicast - Q&A

eBGP routes have an administrative distance of ____, and iBGP routes have an administrative distance of ____.

20, 200

Which multicast addresses do OSPFv2 routers use?

224.0.0.5 for ALLSPFRouters and 224.0.0.6 for ALLDRouters.

As a network designer, you need to influence the outbound routing with your ISP. Which are BGP options to do this? a. AS Path, Local Preference, Weight b. MED, Local Preference, Weight c. AS Path, BGP Communities, MED d. BGP Communities, Local Preference, MED

A

To where are OSPF Type 1 LSAs flooded? a. The OSPF area b. The OSPF domain c. From the area to the OSPF backbone d. Through the virtual link

A

What is the administrative distance of eBGP routes? a. 20 b. 100 c. 110 d. 200

A

Which routing protocol does not support VLSMs? a. RIPv1 b. OSPFv2 c. EIGRP d. RIPv2 e. B and C f. B, C, and D

A

Which of the following statements are true regarding OSPF? (Choose two.) a. ABRs require manual confi guration for summarization. b. ABRs automatically summarize. c. External routes are injected into the autonomous system via the ABR. d. External routes are injected into the autonomous system via the ASBR.

A, D

Which statements are correct? (Choose two.) a. The Dijkstra algorithm is used by both OSPF and IS-IS to calculate the shortest best path. b. IS-IS is a proprietary protocol. OSPF is a standards-based protocol. c. OSPF is only used on enterprise networks and IS-IS by service providers. d. ISIS boundaries are links; OSPF area boundaries are within the routers.

A, D

What constraint does the OSPF network design have for traffic traveling between areas?

All traffic from one area must travel through Area 0 (the backbone) to get to another area.

How many bits are mapped from the Layer 3 IPv4 multicast address to a Layer 2 MAC address? a. 16 bits b. 23 bits c. 24 bits d. 32 bits

B

Route summarization and redistribution occur in which layer of the hierarchical model? a. Building access b. Distribution c. Core d. Server access

B

What is IGMP? a. Interior Group Management Protocol b. Internet Group Management Protocol c. Interior Gateway Routing Protocol d. Interior Gateway Media Protocol

B

What is an ASBR? a. Area Border Router b. Autonomous System Boundary Router c. Auxiliary System Border Router d. Area System Border Router

B

What protocol do you use to exchange IP routes between autonomous systems? a. IGMP b. eBGP c. EIGRP d. OSPF

B

Where should routes be summarized? a. On the core routers b. On the distribution routers c. On the access routers d. None of the above

B

Which protocol defines an Area Border Router (ABR)? a. Enhanced Interior Gateway Routing Protocol (EIGRP) b. Open Shortest Path First (OSPF) c. Intermediate System-to-Intermediate System (IS-IS) d. Routing Information Protocol (RIP)

B

Which routing protocol is recommended for large IPv6 multivendor networks? a. RIPng b. OSPFv3 c. EIGRP for IPv6 d. BGP

B

Which routing protocol provides multivendor support with high scalability and fast convergence? a. RIPv2 b. OSPF c. EIGRP d. BGP

B

Which standards-based routing protocol converges most quickly? a. RIPv2 b. OSPF c. EIGRP d. BGP

B

Which link-state routing protocols support IPv6 routing? a. RIP b. OSPF c. EIGRP d. BGP e. IS-IS

B, E

Which of the following shows the correct order that BGP uses to select a best path? a. Origin, lowest IP, autonomous system path, weight, local preference, MED b. Weight, local preference, autonomous system path, origin, MED, lowest IP c. Lowest IP, autonomous system path, origin, weight, MED, local preference d. Weight, origin, local preference, autonomous system path, MED, lowest IP

B. Only answer B has the correct order of BGP path selection, which is weight, local preference, autonomous system path, origin, MED, and lowest IP.

With ____________, all routers peer with each other within the private autonomous system. With __________, client routers peer only with the reflector.

BGP confederations, route reflectors.

As a network designer, you need to influence the inbound routing with your ISP. Which are BGP options to do this? a. AS Path, Local Preference, Weight b. MED, Local Preference, Weight c. AS Path, BGP Communities, MED d. BGP Communities, Local Preference, MED

C

What address do you use to multicast to the OSPFv2 designated router (DR)? a. 224.0.0.1 b. 224.0.0.5 c. 224.0.0.6 d. 224.0.0.10

C

What route should be used to summarize the following networks? 10.150.80.0/23, 10.150.82.0/24, 10.150.83.0/24, 10.150.84.0/22 a. 10.150.80.0/23, 10.150.82.0/23, and 10.150.84.0/22 b. 10.150.80.0/22 and 10.150.84/22 c. 10.150.80.0/21 d. 10.150.80.0/20

C

Which OSPF area allows redistribution of external routers while preventing propagation of Type 5 LSAs? a. Area 0 b. Stub area c. Not so stubby area d. ABR e. Area 1 over a Virtual Link

C

Which of the following best describes route summarization? a. Grouping contiguous addresses to advertise a large Class A network b. Grouping noncontiguous addresses to advertise a larger network c. Grouping contiguous addresses to advertise a larger network d. Grouping Internet addresses

C

Which of the following statements is correct? a. OSPFv3 provides changes to OSPFv2 for use in IPv4 networks. b. OSPFv3 provides changes to OSPFv2 for use in IPv6 networks. c. OSPFv3 provides changes to OSPFv2 for use in IPv6 and IPv4 networks. d. OSPFng provides changes to OSPFv2 for use in IPv6 networks.

C

Which routing protocol(s) do not require subinterfaces when operating over nonbroadcast multiaccess point-to-multipoint networks? a. RIP b. OSPF c. EIGRP d. BGP e. IS-IS

C, D

What OSPFv3 LSA has an LS type of 0x0008? a. Router LSA b. Inter-area-router LSA c. Link LSA d. Intra-area-prefi x LSA

C. Link LSAs are flooded to the local link.

What feature did BGPv4 implement to provide forwarding of packets based on IP prefixes?

CIDR was first implemented in BGPv4.

What is the default OSPF cost for a Fast Ethernet interface?

Cost is calculated as 10^8 / BW, and BW = 100 Mbps = 10^8 bps for Fast Ethernet. Cost = 10^8 / 10^8 = 1.

PIM-SM is configured on the network. Which protocol prevents media streams from being broadcast on the access switch? a. PIM-SM RD b. IGMPv3 c. Auto-RP d. IGMP snooping

D

What OSPFv3 LSA carries address prefixes? a. Network LSA b. Summary LSA c. Inter-area-router LSA d. Intra-area-prefix LSA

D

Which protocol is commonly used to connect to an ISP? a. RIPv2 b. OSPF c. EIGRP d. BGP

D

What is the OSPFv2 link-state advertisement (LSA) type for autonomous system external LSAs? a. Type 1 b. Type 2 c. Type 3 d. Type 4 e. Type 5

E

Which routing protocols have fast convergence for IPv4 networks? a. BGP b. OSPFv2 c. EIGRP d. RIPv2 e. B and C f. B, C, and D g. A, B, and C

E

When BGP confederations are used, which number do external peers see?

External peers see the confederation ID. The internal private autonomous system numbers are used within the confederation.

Which routing protocols have fast convergence for IPv6 networks? a. RIPng b. OSPFv3 c. EIGRP for IPv6 d. RIPv2 e. MP-BGP f. B and C g. B, C, and D h. B, C, and E

F

Which routing protocols are recommended for large enterprise networks? a. RIPv2 b. OSPFv2 c. EIGRP d. IS-IS e. A and B f. B and C g. B and D h. A, B, C, and D

F. EIGRP and OSPFv2 are recommended for large enterprise networks.

Which multicast addresses are used by OSPFv3 routers?

FF02::5 for ALLSPFRouters and FF02::6 for ALLDRouters.

What IPv6 multicast address does EIGRP use for IPv6?

FF02::A.

True or false: A router needs to have all its interfaces in Area 0 to be considered an OSPF backbone router.

False

True or false: Autonomous system path is the only attribute BGP uses to determine the best path to the destination.

False. BGP uses several attributes in the BGP decision process

True or false: BGP Version 4 does not include support for CIDR, only OSPF and EIGRP do.

False. BGPv4 added support for classless interdomain routing (CIDR), which provides the capability of forwarding packets based on IP prefixes only, with no concern for the address class.

True or false: PIM has a hop-count limit of 32.

False. PIM does not have a hop-count limit. DVMRP has a hop-count limit of 32.

True or false: The router with the lowest priority is selected as the OSPF DR.

False. The router with the highest priority is selected as the OSPF designated router.

True or false: You use iBGP to exchange routes between different autonomous systems.

False. You use eBGP to exchange routes between different autonomous systems.

Which routing protocols support variable-length subnet masks (VLSMs)? a. EIGRP b. OSPF c. IS-IS d. A and B e. A and C f. B and C g. A, B, and C

G

A retail chain has about 800 stores that connect to the headquarters and a backup location. The company wants to limit the amount of routing traffic used on the WAN links. What routing protocol(s) is/are recommended? a. RIPv1 b. RIPv2 c. OSPFv2 d. EIGRP e. IS-IS f. BGP g. B, C, and D h. C and D i. C, D, and E

H

What is included in an OSPFv2 router LSA?

Included are the router's links, interfaces, state of links, and cost.

Which OSPFv2 router type generates the OSPF Type 3 LSA?

OSPF ABRs generate the Type 3 summary LSA for ABRs.

Which OSPFv2 router type generates the OSPF Type 2 LSA?

OSPF DRs generate Type 2 network LSAs.

Which routing protocol do you use in the core of a large enterprise network that supports VLSMs for a network with a mix of Cisco and non-Cisco routers?

OSPF. Although RIPv2 and EIGRP support VLSMs, RIPv2 is no longer recommended. EIGRP is not supported on non-Cisco routers.

How is OSPFv3 identified as the upper-layer protocol in IPv6?

OSPFv3 is identified as IPv6 Next Header 89.

List three IP routing protocols that use multicast addresses to communicate with their neighbors.

RIPv2, OSPF, and EIGRP.

What is the purpose of route reflectors?

Route reflectors reduce the number of iBGP logical mesh connections.

What is the Cisco administrative distance of OSPF?

The administrative distance of OSPF is 110.

True or false: IGMP snooping and CGMP are methods to reduce the multicast traffic at Layer 2.

True

True or false: OSPF and IS-IS use a designated router in multiaccess networks.

True

True or false: PIM-SM routers use the multicast 224.0.0.13 address to request a multicast group to the RP.

True

True or false: eBGP and iBGP redistribute automatically on a router if the BGP peers are configured with the same autonomous system number.

True

Which Cisco feature can you use instead of local preference to influence the selected path to external BGP routers?

Weight. Weight is configured locally and not exchanged in BGP updates. On the other hand, the local preference attribute is exchanged between iBGP peers and is configured at the gateway router.

What is the benefit of designing for stub areas?

You do not need to flood external LSAs into the stub area, which reduces LSA traffic.

Match the BGP attribute with its description. i. Local preference ii. MED iii. Autonomous system path iv. Next hop a. IP address b. Indicates the path used to exit the autonomous system c. Tells external BGP peers the preferred path into the autonomous system d. List of ASNs

i = B, ii = C, iii = D, iv = A.

Match the routing protocol with the description: i. EIGRP ii. OSPFv2 iii. RIPv2 iv. BGP a. Distance-vector protocol used in the edge of the network b. IETF link-state protocol used in the network core c. Hybrid protocol used in the network core d. Path-vector protocol

i = C, ii = B, iii = A, iv = D

Match the IPv6 multicast address with its description. i. FF02::1 ii. FF02::2 iii. FF02::5 iv. FF02::9 v. FF02::A a. OSPFv3 routers b. RIPng routers c. All routers d. EIGRP routers e. All nodes

i = E, ii = C, iii = A, iv = B, v = D

Match the IP multicast address with its description. i. 224.0.0.1 ii. 224.0.0.2 iii. 224.0.0.5 iv. 224.0.0.10 a. All OSPF routers b. All routers c. EIGRP routers d. All hosts

i =D, ii = B, iii = A, iv = C.