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QUESTION 78
You are the network administrator at Flydumps. You are in the planning stages of upgrading the Certkiller network, and need to decide which protocol to use. You need to choose a protocol that will meet the following goals: Supports classless routing Supports VLSM Does not rely on TCP/IP to exchange routing information Performs auto-summarization by default Allows for manual route summarization Which routing protocol should you implement on the Certkiller network?
A. BGP
B. EIGRP
C. OSPF
D. IS-IS
E. IGRP
F. RIPv2
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: EIGRP is a classless protocol that supports VLSM and performs auto-summarization of subnets by default. The subnet routes are summarized into a single network number aggregate. In addition, IP-EIGRP will allow aggregation on any bit boundary in an IP address and can be configured on a network interface for additional granularity. EIGRP also supports automatic summarization of network addresses at major network borders. There is an automatic redistribution mechanism used so IGRP routes are imported into EIGRP and vice versa. Since the metrics for both protocols are directly translatable, they are easily comparable as if they were routes that originated in their own AS.
QUESTION 79
Which routing protocol: (1) is intended to support large routing domains consisting of combinations of many media types, (2) may be used as an IGP, and (3) supports multiple routed protocols in an integrated manner rather than “Ships in the Night” method?
A. EIGRP
B. OSPF
C. IS-IS
D. BGP
E. None of the above
Correct Answer: A Section: (none) Explanation
Explanation/Reference:
Explanation:
EIGRP is a very scalable Interior Routing Protocol (IGP) that supports large networks. In
addition to support for IP, EIGRP can be used for routing IPX and Appletalk networks.
Incorrect Answers:
B, C: Although OSPF and IS-IS are link state protocols that are used as IGPs and are highly
scalable, they do not provide support for routed networks such as those used by Novell and
Apple.
D: BGP only supports IP, and is generally used only for external routing.
QUESTION 80
Match the correct routing protocol on the left to its characteristics on the right side. Note that not all answer choices will be used.
A.
B.
C.
D.
Correct Answer: Section: (none) Explanation
QUESTION 81
PDR is being used as the routing protocol for a new Certkiller network. Which network topology is best suited for ODR?
A. highly redundant
B. fully meshed
C. dual self-healing ring
D. hub and spoke
E. NBMA
Correct Answer: D Section: (none) Explanation
Explanation/Reference:
Explanation: On Demand Routing (ODR) is a mechanism that provides minimum-overhead IP routing for stub sites. The overhead of a general dynamic routing protocol is avoided, without incurring the configuration and management overhead of using static routing. A stub router is the peripheral router in a hub and spoke network topology. Stub routers commonly have a WAN connection to the hub router and a small number of LAN network segments (stub networks) that are connected directly to the stub router. To provide full connectivity, the hub routers can be statically configured to know that a particular stub network is reachable via a specified access router. However, if there are multiple hub routers, many stub networks, or asynchronous connections between hubs and spokes, the overhead required to statically configure knowledge of the stub networks on the hub routers becomes too great. ODR simplifies installation of IP stub networks in which the hub routers dynamically maintain routes to the stub networks. This is accomplished without requiring the configuration of an IP routing protocol at the stub routers. With ODR, the stub advertises IP prefixes corresponding to the IP networks that are configured on its directly connected interfaces. Because ODR advertises IP prefixes, rather than IP network numbers, ODR is able to carry Variable Length Subnet Mask (VLSM) information. Once ODR is enabled on a hub router, the router begins installing stub network routes in the IP forwarding table. The hub router can also be configured to redistribute these routes into any configured dynamic IP routing protocols. IP does not need to be configured on the stub router. With ODR, a router is automatically considered to be a stub when no IP routing protocols have been configured on it.
QUESTION 82
Your company, Certkiller Inc, has a central office and a remote branch office. Each site has a separate autonomous system (AS) as well as a separate Internet connection. In this network, what is the best method to route Internet traffic.
A. IGP routing
B. BGP routing
C. Configure “ip route prefix mask”
D. Configure “ip default-gateway ip address”
E. Configure IS-IS
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: Border Gateway Protocol (BGP) is used to exchange routing information for the Internet and is the protocol used between Internet service providers (ISP). In order to take full advantage of multiple Internet connections, as well as multiple Internet providers, BGP is the best choice to ensure full redundancy. Reference: http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/bgp.htm Incorrect Answers:
A: Customer networks usually employ an Interior Gateway Protocol (IGP) such as RIP or OSPF for the exchange of routing information within their networks. C, D: Using statically assigned default routes and default gateways is a simplistic approach that works well in many situations, but will not provide for automatic failover and does not provide the routing options that BGP provides.
E: IS-IS is used exclusively as an IGP.
QUESTION 83
The Certkiller network is in the process of migrating the IP address scheme to use IPv6. Which of the following address types are associated with IPv6? (Select three)
A. Unicast
B. Private
C. Broadcast
D. Public
E. Multicast
F. Anycast
Correct Answer: AEF Section: (none) Explanation
Explanation/Reference:
Explanation:
IP version 6 introduced the concet of anycasts. The three IP address types used for IPv6 are:
Unicast – An IPv6 unicast address is an identifier for a single interface, on a single node. A packet that is
sent to a unicast address is delivered to the interface identified by that address.
Anycast – An anycast address is an address that is assigned to a set of interfaces that typically belong to
different nodes. A packet sent to an anycast address is delivered to the closest interface-as defined by the
routing protocols in use-identified by the anycast address.
Multicast – An IPv6 multicast address is an IPv6 address that has a prefix of FF00::/8 (11111111). An IPv6
multicast address is an identifier for a set of interfaces that typically belong to different nodes. Reference:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide_chapter0918
6a0080110dd2.html#99899
QUESTION 84
What number is a valid representation for the 200F:0000:AB00:0000:0000:0000:0000/56 IPv6 prefix?
A. 200F:0:0:AB/56
B. 200F:0:AB00::/56
C. 200F::AB00/56
D. 200F:AB/56
Correct Answer: B Section: (none) Explanation
Explanation/Reference:
Explanation: Due to the method of allocating certain styles of IPv6 addresses, it will be common for addresses to contain long strings of zero bits. In order to make writing addresses containing zero bits easier a special syntax is available to compress the zeros. The use of “::” indicates multiple groups of 16-bits of zeros. The “::” can only appear once in an address. The “::” can also be used to compress the leading and/or trailing zeros in an address. For example the following addresses: 1080:0:0:0:8:800:200C:417A a unicast address FF01:0:0:0:0:0:0:43 a multicast address 0:0:0:0:0:0:0:1 the loopback address
0:0:0:0:0:0:0:0 the unspecified addresses may be represented as: 1080::8:800:200C:417A a unicast address FF01::43 a multicast address ::1 the loopback address :: the unspecified addresses In our example, the trailing zero’s can be compressed into ::, giving us 200F:0:AB00:: as the address.
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