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CCDA FAQ: Designing for Specific Protocols

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CCDA FAQ: Designing for Specific Protocols

Q1. List two distance vector routing protocols for IP.

Answer:

  • Routing Information Protocol (RIP)
  • Interior Gateway Routing Protocol (IGRP)

Q2. What is the subnet number and broadcast address for host 199.1.10.9/30?

Answer: 199.1.10.8 is the subnet number; 199.1.10.11 is the broadcast address.

Q3. How many route entries can there be in an IGRP update packet?

Answer: 104

Q4. What is the default mask for 191.50.0.0?

Answer: 255.255.0.0

Q5. Is 001DG6Ef a valid IPX address?

Answer: No. IPX addresses represented in hexadecimal do not have a G.

Q6. What is RTMP?

Answer: Routing Table Maintenance Protocol. RTMP is the distance vector routing protocol for AppleTalk networks.

Q7. What is NLSP?

Answer: NetWare Link-Services Protocol. NLSP is the link-state routing protocol for Novell networks.

Q8. What is the broadcast address for network 192.100.7.64 with a mask of 255.255.255.192?

Answer: The broadcast address is 192.100.7.127.

Q9. Name three IP interior gateway routing protocols that support authentication.

Answer: EIGRP, OSPF, RIPv2, and IS-IS

Q10. Which routing protocol is capable of routing IPX and AppleTalk packets in addition to IP?

Answer: Enhanced Interior Gateway Routing Protocol (EIGRP)

Q11. Which protocol advertises services by producing broadcasts every 60 seconds?

Answer: Novell’s Service Advertising Protocol (SAP)

Q12. Which protocol defines areas for IP networks? Which protocol defines areas for IPX networks?

Answer:

  • OSPF defines areas for IP networks.
  • NLSP defines areas for IPX networks.

Q13. What is the host address of the AppleTalk address 15.4.1? What is the network address? What is the socket number?

Answer: The host address is 4, the network address is 15, and the socket number is 1.

Q14. True or False: RIP version 2 sends route updates only when a change occurs on the network.

Answer: False. RIP version 2 still sends periodic updates every 30 seconds.

Q15. What are the default metrics used by EIGRP?

Answer: The default metrics are bandwidth and delay.

Q16. List three Cisco IOS features.

Answer: Cisco IOS features include access lists, encryption, proxy services, compression, traffic shaping, and queuing (custom, priority, and weighted-fair).

Q17. What protocol encapsulates AppleTalk packets in UDP for transport over an IP network?

Answer: AppleTalk Update-Based Tunneling Protocol (AURP)

Q18. What is the subnet address for host 150.76.78.71 with a mask of 255.255.255.224?

Answer: 150.76.78.64

Q19. This routing protocol defines areas, domains, and supports hierarchical addressing.

Answer: NetWare Link-Services Protocol (NLSP); OSPF does not define domains

Q20. What is an ABR?

Answer: Area border router. Used in OSPF, ABRs connect OSPF areas to Area 0 and perform route summarization.

Q21. Which protocol produces route updates every 10 seconds?

Answer: Routing Table Maintenance Protocol (RTMP). RTMP is the distance vector routing protocol for AppleTalk.

Q22. What routing protocol is used to communicate with Internet routers?

Answer: Border Gateway Protocol (BGP)

Q23. What routing protocol is recommended for hub-and-spoke topologies with lowbandwidth links with no route redundancy?

Answer: Static routing is recommended for this topology with low bandwidth links.

Q24. What is the host portion of 125.240.32.45, assuming default subnet masking?

Answer: This is a Class A address with a default mask of 255.0.0.0. The host portion is 240.32.45.

Q25. This protocol supports route summarization, but it must be configured. If link flapping occurs, streams of updates are generated, causing router CPU overhead.

Answer: This describes a link-state protocol, such as OSPF.

Q26. If a customer is looking for ways to reduce WAN traffic and is also considering tunneling AppleTalk in IP, what protocol would you recommend?

Answer: AppleTalk Update-Based Tunneling Protocol

Q27. This protocol limits the number of route entries in a routing table update to 50 routes.

Answer: Novell’s IPX RIP limits updates to 50 routes.

Q28. What is the network portion for an NLSP area of 0020ab00 with a mask of FFFF0000?

Answer: The network portion is 0020.

Q29. Of the following, which are valid IPX networks?

Answer:

  • 01010101
  • DADA
  • 789ABCDE
  • 204A6B8CE
  • 0FG3ABD4
  • 10
  • 0AB04

01010101 is a valid IPX network.

DADA is a valid IPX network.

789ABCDE is a valid IPX network.

024A6B8CE is not a valid IPX network. It is too long because IPX
addresses are limited to 32 bits (4 bytes or 8 hexadecimal characters).

0FG3ABD4 is not a valid IPX network. G is not a hexadecimal character.

10 is a valid IPX network.

0AB04 is a valid IPX network.

Q30. Is 140.176.30.31/28 a valid host address?

Answer: No. This address is in network 140.176.30.16, with valid host addresses from 140.176.30.17 to 140.176.30.30, and where 140.176.30.31 is the broadcast address for the subnet.

Q31. Convert the following IP address to the dotted decimal format: 00011011011011001100110000101111

Answer:
00011011 is 27.
01101100 is 108.
11001100 is 204.
00101111 is 47.
The answer is 27.108.204.47.

Q32. If the client wants to use a nonproprietary routing protocol that can scale to hundreds of networks and fit in a hierarchical topology, which routing protocol can be recommended?

Answer: Recommend OSPF. It is standards-based and can scale to a large network in a hierarchical topology.

Q33 If a client wants to use a routing protocol that is easy to configure and that can scale to hundreds of networks, and if all routers are Cisco routers, which routing protocol can be recommended?

Answer: Recommend EIGRP. It is Cisco’s hybrid protocol that can scale in large networks.

Q34. What is an ASBR?

Answer: Autonomous system boundary router. This term is used in OSPF networks to identify those routers that have connections to external networks.

Q35. What is a stub network in OSPF?

Answer: A stub network does not receive External LSAs (type 5) from the ABR. A default gateway (0.0.0.0) is sent instead. Network Summary LSAs (type 3) are still sent in the area.

Q36. What is a totally stubby network in OSPF?

Answer: A totally stubby area does not receive External (type 5) and Network Summary (type 3) LSAs from the ABR. A default gateway (0.0.0.0) is sent instead. This significantly reduces that amount of LSAs sent into the area.

Q37. True or False: Bridged networks provide large scalability.

Answer: False. Bridge networks are subject to broadcasts and multicast in the entire network, limiting their size in the internetwork.

Q38. True or False: To reduce the traffic in bridge networks it is recommended to limit the size of the network and use routing to segment the network.

Answer: True. Use routers to segment bridged networks into smaller segments.

Q39. RIP uses a feature in which routes learned from a neighboring router are sent back to that neighbor with an infinite unreachable metric. What is that feature?

Answer: Split horizon with poison reverse

Q40. What is the update time in IGRP?

Answer: IGRP sends updates every 90 seconds.

Q41. Does EIGRP send periodic updates?

Answer: No. EIGRP sends updates only when a metric is changed on a route. The update includes only that route and is sent only to those routers affected by that route.

Q42. Which queuing technique can be recommended to prioritize mission-critical SNA traffic?

Answer: Priority queuing

Q43. List at least four Cisco IOS features.

Answer: Cisco IOS features include access lists, encryption, proxy services, compression, traffic shaping, and queuing (custom, priority, and weighted fair).

Q44. True or False: The order in which access list commands are configured is not significant to the router.

Answer: False. The order of access list statements is important. The router tests against each criteria statement in the order in which the statements were created.

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