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QUESTION 31 You are the network administrator at Cisco Highway. Your assistant issued the following command on a Cisco Highway router. Cisco Highway(config)#ip route 172.27.6.0 255.255.255.0 s0/0 What conclusions can you draw from this command? (Choose all that apply.)
A. This is a route to interface s0/0 on the next hop router.
B. Packets destined for this network are sent via interface s0/0 on Cisco Highway.
C. Packets destined for this network enter router Cisco Highway through interface s0/0.
D. There is only one path to this network from Cisco Highway.
E. This is a route to a public network. Answer: B, D Explanation: Ip route prefix mask {address|Interface} [distance] [tag tag] [permanent] Prefix 172.27.6.0 mask 255.255.255.0 address 172.17.8.2 Address - The IP address of the next hop router that can be used to reach that network. Interface - The network interface to use to get to the destination network. Reference: Building Scalable Cisco Networks (Cisco press) page 464
QUESTION 32 Which of the following features are associated with the distribution layer of the three-layer hierarchical network design model? (Choose all that apply.)
A. Optimized transport structure
B. Route redistribution
C. Unauthorized entry access control lists
D. Address aggregation
E. Reliable transport structure Answer: B, D
QUESTION 33 You are the network administrator at Cisco Highway. The router topology for the Cisco Highway network is shown in the following exhibit: You want to apply a route map named ISPA to interface E0. Which set of commands will you use?
A. Cisco Highway1(config)#interface e0 Cisco Highway1(config-if)#policy route-map ISPA
B. Cisco Highway1(config)#interface e0 Cisco Highway1(config-if)#ip policy route-map ISPA
C. Cisco Highway1(Config)#interface e0 Cisco Highway1(Config-if)#policy route map ISPA
D. Cisco Highway1(config)#interface e0 Cisco Highway1(config-if)ip route-map ISPA Answer: B Explanation: Identifies the route map to use for PBR. One interface can only have one route-map tag, but you can have multiple route map entries with different sequence numbers. These entries are evaluated in sequence number order until the first match. If there is no match, packets will be routed as usual. Reference: http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_guide_chapter09186a00801 9d0dd.html
QUESTION 34 What conclusions can you draw from the binary address: 11000000.10100100.10100110.00010101?
A. It is a Class B public address.
B. It is a Class C public address.
C. It is a Class B private address
D. It is a Class D experimental address.
E. It is a Class C private address. Answer: B Explanation: 11000000.10100100.10100110.00010101 = 192.164.166.21 = A public Class C address Reference: Building Scalable Cisco Networks (Cisco press) page 66
QUESTION 35 You are a technician at Cisco Highway. Your newly appointed Cisco Highway trainee wants to know which of the routing protocol multicast routing updates mentioned below uses Class D address 224.0.0.9. What would your reply be?
A. EIGRP
B. IGRP
C. OSPF
D. RIPv2 Answer: D Explanation: Class D addresses are not as widely used. Class D addresses are multicast addresses; some Class D multicast addresses used by routing protocols are as follows:
- OSPF - 224.0.0.5 and 224.0.0.6
- Routing Information Protocol version 2 (RIPSv2) - 224.0.0.9
- EIGRP - 224.0.0.10 Reference: Building Scalable Cisco Networks (Cisco press) page 69
QUESTION 36 You are the network administrator at Cisco Highway. The router topology for the Cisco Highway network is shown in the following exhibit:
Router Cisco Highway5 makes use of a LSA type 7 to announce changes in the status of external network 22 to area
1. Which OSPF term will you use to describe area 1?
A. Stub area
B. Totally stubby area
C. Normal area
D. Transit area
E. Not-so-stubby area
Answer: E Explanation:
- Stub Areas: These areas do not accept routes belonging to external autonomous systems (AS); however, these areas have inter-area and intra-area routes. In order to reach the outside networks, the routers in the stub area use a default route which is injected into the area by the Area Border Router (ABR).
- Normal Areas: These areas can either be standard areas or transit (backbone) areas. Standard areas are defined as areas that can accept intra-area, inter-area and external routes.
- backbone area is the central area to which all other areas in OSPF connect.
- Totally Stub Areas: These areas do not allow routes other than intra-area and the default routes to be propagated within the area. The ABR injects a default route into the area and all the routers belonging to this area use the default route to send any traffic outside the area.
- NSSA (Not-so-stubby area): This type of area allows the flexibility of importing a few external routes into the area while still trying to retain the stub characteristic. Assume that one of the routers in the stub area is connected to an external AS running a different routing protocol, it now becomes the ASBR, and hence the area can no more be called a stub area. However, if the area is configured as a NSSA, then the ASBR generates a NSSA external link-state advertisement (LSA) (Type-7) which can be flooded throughout the NSSA area. These Type-7 LSAs are converted into Type-5 LSAs at the NSSA ABR and flooded throughout the OSPF domain Reference: http://www.cisco.com/en/US/tech/tk365/tk480/technologies_tech_note09186a0080094a74.shtml
QUESTION 37 How would you describe a domain in OSI terms?
A. A set of non-routing network nodes only.
B. Contiguous set of routers and hosts linked to the same data Links.
C. A contiguously connected area that can reach all other areas simultaneously.
D. Any part of an OSI network that is under a common administrative authority. Answer: D Explanation: An AS is a collection of networks under a common administration that share a common routing strategy. Autonomous systems are subdivided into areas, and an AS is sometimes called a domain. Reference: http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/introint.htm
QUESTION 38 Which of the following statements regarding the BGP synchronization command is true? (Choose all that apply.)
A. Synchronization must be enabled when implementing a multi-homed BGP connection to multiple ISPs.
B. Synchronization enhances BGP routing convergence.
C. If turned ON, a prefix learned from IBGP neighbor is valid only in the presence of a non-bgp (IGP) route.
D. Synchronization is necessary when engaging in a peer-to-peer relationship with an EBGP neighbor.
E. Synchronization can be disabled if all the transit routers in an Autonomous system is running full mesh IBGP. Answer: A, E Explanation: If your autonomous system (AS) will be passing traffic through it from another AS to a third AS, it is very important that your AS be consistent about the routes that it advertises. For example, if your BGP were to advertise a route before all routers in your network had learned about the route through your IGP, your AS could receive traffic that some routers cannot yet route. To prevent this from happening, BGP must wait until the IGP has propagated routing information across your autonomous system. This causes BGP to be synchronized with the IGP. Synchronization is enabled by default. Only if all routers in the transit path in the AS are running BGP it is safe to turn synchronization off. Reference: Building Scalable Cisco Networks (Cisco press) page 33 http://www.cisco.com/en/US/products/sw/iosswrel/ps1826/products_configuration_guide_chapter09186a00800 877b5.html
QUESTION 39 You are the network administrator at Cisco Highway. Your newly appointed Cisco Highway trainee wants to know which of the following NSAP addresses are a private, locally administered addresses. What would your reply be? (Choose all that apply.)
A. 39.0f01.0d02.0000.0c00.1111.00
B. 43.0f01.2c06.0000.0c00.1d11.00
C. 47.00f1.4d01.0000.3090.c4d0.00
D. 49.0004.30ac.0000.30dc.c7df.00
E. 52.0f01.3c02.0000.0c00.11c1.00 Answer: A, C Explanation: The private NSAP addresses have AFI beginning with 39, 45 and 47. AESA Network Service Access Point (NSAP) ATM Addresses There are 3 types of private ATM addresses:
- NSAP encoding format for E.164 addresses - The authority and format identifier (AFI) is 45. These addresses are used in establishing ISDN calls by public networks, and they are normally used in public telephony.
- Data Country Code (DCC) AESA - The AFI is 39. These addresses are to be used in public networks. For example, the initial domain identifier (IDI) value 0x84.0f identifies the United States.
- International Code Designator (ICD) AESA - The AFI is 47. These addresses are used in private organizations, and the ICD field indicates the code set or organization. Cisco uses by default ICD addresses. Reference: http://www.cisco.com/en/US/tech/tk39/tk49/technologies_tech_note09186a00800c9761.shtml
QUESTION 40 Which IS-IS metric type is the only type that Cisco IOS will support?
A. Default
B. Delay
C. Bandwidth
D. Expense
E. Error Answer: A Explanation: The original IS-IS specification defines four different types of metrics. Cost, being the default metric, is supported by all routers. Delay, expense, and error are optional metrics. The delay metric measures transit delay, the expense metric measures the monetary cost of link utilization, and the error metric measures the residual error probability associated with a link. The Cisco implementation uses cost only. If the optional metrics were implemented, there would be a link-state database for each metric and SPF would be run for each link-state database. typically is assigned by a network administrator. Any single link can have a maximum value of 64, and path Links are calculated by summing link values. Maximum metric values were set at these levels to provide the granularity to support various link types while at the same time ensuring that the shortest-path algorithm used for route computation will be reasonably efficient. IS-IS also defines three optional metrics (costs): delay, expense, and error. Reference: http://www.cisco.com/en/US/tech/tk365/tk381/technologies_white_paper09186a00800a3e6f.shtml
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