Section 47 – Review 5

Section 47 Tasks

  • Take the exam below
  • Complete the challenge lab
  • Review OSPF
  • Read the ICND2 cram guide (and the ICND1 cram guide, if taking the CCNA exam)
  • Spend 15 minutes on the subnetting.org website

Section 47 Exam

  1. You can see the ASN with the show ip _______ command.
  2. Every router you want to communicate with in your routing domain must have a different ASN. True or false?
  3. What is the purpose of the EIGRP topology table?
  4. By default, EIGRP uses the _______ bandwidth on the path to a destination network and the total _______ to compute routing metrics.
  5. Dynamic neighbour discovery is performed by sending EIGRP Hello packets to the destination Multicast group address _______.
  6. EIGRP packets are sent directly over IP using protocol number _______.
  7. To populate the topology table, EIGRP runs the _______ algorithm.
  8. The _______ _______ includes both the metric of a network as advertised by the connected neighbour, plus the cost of reaching that particular neighbour.
  9. Cisco IOS software supports equal cost load sharing for a default of up to four paths for all IGP routing protocols. True or false?
  10. Which EIGRP command can be used to enable unequal cost load sharing?

Section 47 Answers

  1. protocols.
  2. False.
  3. The topology table allows all EIGRP routers to have a consistent view of the entire network. All known destination networks and subnets that are advertised by neighbouring EIGRP routers are stored there.
  4. Minimum, delay.
  5. 224.0.0.10.
  6. 88.
  7. DUAL.
  8. Feasible Distance.
  9. True*.
  10. variance.

* Four entries is the default in IOS for IGPs, but for BGP one entry is the default. Six different paths configured is the maximum number.

Section 47 Lab – EIGRP and ACL

Topology

Section 47 – Review 5 1

Instructions

Connect two routers together with a serial or crossover cable:

  1. Add IP addresses to the routers and a Loopback interface on Router A and Router B, according to the diagram
  2. Ping between Router A and Router B to test the serial line (remember clock rates)
  3. Configure EIGRP 30 on both routers
  4. Add all routes and add wildcard masks
  5. Check the routing table. Were the routes summarised?
  6. Now add the no auto-summary command to the EIGRP process
  7. Ping all routes
  8. Now add a named ACL on Router B; only Telnetting to 10.2.2.2 should be permitted
  9. Make sure you have enabled Telnet and have added a username/password
  10. Test the ACL by attempting to connect to 172.16.1.6 first, and then to 10.2.2.2
  11. If EIGRP is no longer working, why would that be and how do you fix the issue?

Solution Hints and Commands

  • router eigrp 30 network 0.0.0.0 255.255.255.255
  • show ip route to check the routing table
  • ip access-list to add a named ACL
  • username x password y


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