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QUESTION 171 In order to determine the "best" path to a destination network, you need to add which two path costs together? (Select two.)
A. feasible distance
B. partial distance
C. advertised distance.
D. agregate distance
E. next hop distance Answer: C, E Explanation: Two path costs would be advertised distance plus the next hop distance. Source: BSCI Self Study Cisco Press (2003) 2nd EditionP362-363.
QUESTION 172 What could cause EIGRP routes to be considered "stuck-in-active"?
A. the route being reported by the "stuck-in-active" message no longer exists.
B. the route being reported by the "stuck-in-active" message has been activated.
C. a query for the route generated by an EIGRP neighbor has not yet been replied to.
D. a query for the route generated by an OSPF neighbor has not yet been replied to. Answer: A, C Explanation: The "stuck-in-active" message refers to the condition in which a primary route is no longer available and no feasible successor is available. The EIGRP router has sent out a query to its neighbors and no reply has been heard back for three minutes. Chapter: 4
QUESTION 173 What are Query, Update and Reply known as?
A. EIGRP renewable packets
B. EIGRP reliable packets
C. TCP/IP reliable packets
D. Query All packets
E. OSPF reliable packets Answer: B Explanation: EIGRP utilizes five different types of packets: 1) ACK 2) hello 3) query 4) reply 5) update These packets are instrumental in EIGRP's ability to reliably route packets from source to destination network. The "reliable packets" are query, update, and reply. Chapter: 4
QUESTION 174 You are a technician at Cisco Highway. Cisco Highway has an IS-IS network. Your newly appointed Cisco Highway trainee wants to know what IS-IS stand for. What would your reply be?
A. intercontinental station-to-intercontinental station
B. intermediate section-to-intermediate section
C. intermediate station-to-intermediate station
D. intermediate system-to-intermediate system Answer: D Explanation: The intermediate system-to-intermediate system routing protocol, more commonly known as IS-IS was developed by Digital Equipment Corporation. Chapter: 4
QUESTION 175 Which of the following attributes are common to both OSPF and IS-IS?
A. they both maintain a link-state database.
B. they both run the SPF algorithm to determine the shortest path to destination networks
C. they both utilize the concept of "areas" to maintain hierarchical network topologies
D. they both use RIP as their data transfer medium
E. they both communicate via port 80 when sending routing updates Answer: A, B, C Explanation: IS-IS and OSPF share a number of common features; link-state databases, the running of the SPF algorithm, the use of "areas" among other similarities. Chapter: 4
QUESTION 176 Which of the following subnet masks is the most optimized for providing five internet addresses?
A. 225.255.255.192
B. 225.255.255.248
C. 225.255.255.255
D. 225.255.255.254 Answer: B Explanation: Do the math and win a prize! This should have taken you about 5 minutes to answer. The subnet mask 255.255.255.248 will give you 32 subnets with 6 hosts per subnet. Sounds pretty efficient to me. If you want a great shortcut for figuring out number of hosts per subnet, subtract 248 from 256, that leaves you with 8 right? Subtract two from 8 (can't use the first and last addresses in the range) and you are left with 6. There are six hosts in each of the subnets. It works every time. The other subnet masks: 255.255.255.192 = 4 subnets with 62 hosts per subnet, way too many hosts. 255.255.255.255 = Gong! I hope no one fell for this one 255.255.255.254 = 128 subnets with two hosts per subnet, won't work if you need five hosts. (*TIP* use this for point to point serial connections) Chapter: 4
QUESTION 177 On a point-to-point network, what acknowledges each LSP that it receives.
A. PSNP
B. POPN
C. BPDU
D. LMNOPAnswer: A Explanation: On a point-to-point IS-IS network, an LSP(Link State Packet) is generated to announce a router's Links and the status of the those Links. When the LSP is received, a PSNP (Partial Sequence Number Packet) is sent to acknowledge each of the LSPs that are received. Chapter: 4
QUESTION 178 What is the IS-IS equivalent of the OSPF backbone Area 0?
A. level-0 backbone
B. area 0 backbone
C. level-1 backbone
D. level-2 backbone Answer: D Explanation: In order to answer this question, we are only going to deal with Level-1 and Level-2 routers (I see the guy with his hand raised...Yes, there are Level1/2 routers in IS-IS as well). The Level-1 routers are similar to OSPF areas; they are independent of each other and require a concentration point to share routing updates. It is in this capacity that the Level-2 backbone functions. Level-2 routers provide the common connection point through which route updates from the other Level-1 routers flow. This concept has been highly simplified, but with good reason...hint-hint. Chapter: 4 QUESTION 179 With which of the following can Level-2 IS routers establish an adjacency?
A. Level-1 IS in the same area
B. Level-2 IS in a different area
C. Level-2 IS in the same area
D. Level-1 IS in a different area Answer: B, C Explanation: L2 router only establish adjacency with other L1/L2 or L2 routers - - never with a plain L1 router
QUESTION 180 Which of the following are most like an OSPF Area Border Router (ABR)?
A. Level 1 IS
B. Level 2 IS
C. Level1/Level2 IS
D. Level2/Level3 IS
E. IS-IS Media Border Router (IMBR) Answer: C Explanation: IS-IS L1/L2 routers are a hybrid router type (which is the default setting when activating an IS-IS router). The L1/L2 router is most like the OSPF ABR because L1/L2 routers can connect to both the backbone (L2) and a router in a different area (L1), which as we know an ABR is also capable of doing. Chapter: 4
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