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Last updated: September 29, 2017

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Load the TSHOOT-Ticket1 initial configurations before starting.

Task

The IT Department at your company has created a test bed to do a proof-of-concept. This lab requires Client-1 (Switch-3) to have IPv4/ICMP connectivity to the Server located at 209.65.200.241. At present, Client-1 cannot ping this server. Using Cisco IOS commands, isolate the problem, correct it, and answer the following questions:

Question-1:

  • On which device was the problem located (select one)?
    • DSW1
    • DSW2
    • Client
    • R1
    • R2
    • R3
    • R4

Answer

  • R3

Question-2:

  • The problem was related to which technology (select one)?
    • IGP Neighborships/Adjacencies
    • Prefix/Route Filtering
    • EGP Peering
    • IGP Route Origination
    • EGP Route Origination
    • Route Redistribution
    • Spanning-Tree / STP Security Features
    • VLANs, Trunks, VTP
    • FHRP issues (HSRP, GLBP, VRRP)

Answer

  • IGP Neighborships/Adjacencies

Question-3:

  • What command(s) or action was necessary to fix the problem?

Answer

R3's interface Serial0/0/0.23 was missing an OSPF MD5 Authentication Key

TSHOOT-Ticket1-R3(config)#int ser 0/0/0.23
TSHOOT-Ticket1-R3(config-subif)#ip ospf message-digest-key 1 md5 C1sc0
TSHOOT-Ticket1-R3(config-subif)#end
TSHOOT-Ticket1-R3#

TSHOOT-Ticket1-R3#sho ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
10.1.1.9          0   FULL/  -        00:00:37    10.1.1.6        Serial0/0/0.23
209.65.200.1      1   FULL/DR         00:01:34    10.1.1.1        Serial0/0/0.12
TSHOOT-Ticket1-R3#
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