Plugga CCNP Route--EIGRP

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intro EIGRP

EIGRP

  1. Implement hub and spoke topology: What is important
    CIR of all PVC's,
    IOS version on all routers and
    routing policy (if spokes can be transit point between the two HQ's)
  2. Q: Eigrp statistics of packets
    A: show ip eigrp traffic
  3. Q13: How EIGRP initially populate (seed) its topology table (before talking to neighbors)
    By adding subnets of working interfaces over which static neighbors have been defined
    By adding subnets redistributed from other routing sources
  4. Q16: Autosummary of subnetted classful networks
    The summarization happens on the last router in the classful "bubble"
    Only this router (N2 and B2) need "no auto summary" 
 10.0.0.0-- N1 --10.1.0.0-- N2 --192.168.13.0-- B2 --172.16.16.0-- B1 --172.16.17.0
  1. Q21: What is EIGRP true
    Update packets route reliable change information only to the affected routers.
  2. Q23: Stop wan link AND Hub ethernet to be announced to the Core
    "EIGRP stub" announces WAN-link NET
    should be "Implement a distribute list to exclude the link prefix from the routing updates
    Correct (NOT sic) "Use a mask with the network command to exclude interface serial 0/0/0" (the wan link)
  3. Q28: Never forget to document
    Answer: "It should contain a task that documents the changes made to the configurations.
    0. Rob says create a baseline
    1. Configure variance on R1 and R4
    2. Use traceroute to validate load balancing has been activated
    3. Document configuration changes
    4. Establish a new traffic throughput baseline
    5. Compare the new and old baselines and verify that load balancing is implemented as desired.
  4. Q41: Load balancing over 4 paths (network 10.0.0.0, variance 3 
       /-20--R4--25-\
      /              \
 --  R1--20--R3--10--R5 --
      \              /
       \-10--R2--20-/
  1. Answer: "Becouse R4 is not a feasable Successor (FS), EIGRP will not select the path R1-R4-R5 for load balancing
  2. Q44: EIGRP Truths
    When summarization is configured, the router will also create a route to null 0
    Summarization is configured on a per-interface level.
    Automatic summarization across major network boundaries is enabled by default.
    Rob say's: Also, but not quite: The maximum metric for the specific routes is used as the matric for the summary route.
  3. Q448: AD for EIGRP summary routes

": A: 5

  1. Q52: Order of events when a topology change is, and there is a FS
    A: DUAL is notified
    The neighbour adjacency is deleted
    remove all entries learned from that neighbour
    the feasable route is used (Rob: formerly the Feasable Successor route)
  2. Q53: Which three networks is the router at 172.17.10.2 directly connected to? (Choose three) 
 P 172.17.10.0/24, 1 successors, FD is 28160 semo 15
   via Connected, FastEthernet 0/1

Find 28160 as RD on all routes 

 P 172.17.2.0, 1 successor, FD is 30720, semo 3
  via 172.17.10.2 (30720/28160), FastEthernet0/1
  via 172.17.3.2 (33280/30720), FastEthernet0/3
 P 172.17.3.128, 2 successor, FD is 30720, semo 3
  via 172.17.10.2 (30720/28160), FastEthernet0/1
  via 172.17.3.2 (30720/28160), FastEthernet0/3
  1. A.172.17.0.0/30
    B.172.17.1.0/24
    C.172.17.2.0/24 (Correct)
    D.172.17.3.0/25
    E.172.17.3.128/25 (Correct)
    F.172.17.10.0/24 (Correct)
  2. Q57: 
 10.0.0.0-- Router A --172.16.0.0-- <-Router B->s0 --192.168.5.0
 
  Router B: 
    router eigrp 1
      network 172.16.0.0
      network 172.168.5.0
      distribute-list 7 out s0
    access-list 7 permit 172.16.0.0 0.0.255.255
  1. A: Router B will not advertise the 10.0.0.0/8 network becouse of it is blocked by the ACL
  2. Key concepts of "EIGRP stub" in a hub and spoke network?
    Only remote routers are configured as stubs
    Stub routers are not queried for routes
    A stub router should only have EIGRP hub routers as neighbours (WARNING)
  3. Q60: Which statement for a non-zero value for the load metric (k2) for EIGRP is true? Select the best response
    A: EIGRP considers the load of an interface only when sending an update for some other reason.
    (EIGRP updates are triggered by a change in the network topology (like links, interfaces go up/down, router added/removed (and not by changes in interface load or reliability)
  4. Q64: Which command will display the tweo values used in the calculation of EIGRP metric?
    A: show interface 


 Router# show ip eigrp interfaces
 IP EIGRP interfaces for process 1
 
                 Xmit Queue    Mean   Pacing Time   Multicast   Pending
 Interface   Peers   Un/Reliable   SRTT   Un/Reliable   Flow Timer  Routes
 Di0           0         0/0          0      11/434          0          0
 
 Et0           1         0/0        337       0/10           0          0
 
 SE0:1.16      1         0/0         10       1/63         103          0
 
 Tu0           1         0/0        330       0/16           0          0
  --------------------

router#show interface atm 10/1/0 

        ATM10/1/0 is up, line protocol is up 
        Hardware is cyBus ENHANCED ATM PA 
        MTU 1500 bytes, sub MTU 1500, BW  149760 Kbit, DLY 80 usec, 
           reliability 249/255, txload 1/255, rxload 1/255
  1. Q76 
 key chain fred
 key 3 
 key-string whehew
 interface fa0/0
 ip authentication key-chain eigrp 9 fred
  1. Answer: The configuration is missing one authentication-related configuration command.
    Rob say's: ip authentication mode eigrp <AS> md5
  2. What is true regarding EIGRP route summarization
    A. Manual route summarization is configured in router configuration mode when the router is configured for EIGRP routing.
    B. Manual route summarization is configured on the interface.
    C. When manual summarization is configured, the summary route will use the metric of the largest specific metric of the summary routes. (True?? But wrong answer)
    D. The ip summary-address eigrp command generates a default route with an administrative distance of 90.
    E. The ip summary-address eigrp command generates a default route with an administrative distance of 5. (OBS Note "D"-route AD=5 bara lokalt !!)
    F. When manual summarization is configured, the router immediately creates a route that points to null0 interface

  1. Answer: B E F
  2. Q84: Fix EIGRP Hub on FR NBMA
    A: use no ip split horizon eigrp 1
    NOT no ip split horizon (Läs alla svar !!)
  3. Q88: 
 After implementing EIGRP on your network, you issue the show ip eigrp traffic command on router C. The following output is shown:
 
 RouterC#show ip eigrp traffic
 IP-EIGRP Traffic Statistics for process 1
 Hellos sent/received: 2112/2076
 Updates sent/received: 47/38
 Queries sent/received: 5/3
 Replies sent/received: 3/4
 Acks sent/received: 29/33
 Input queue high water mark 2, 0 drops
 SIA-Queries sent/received: 0/0
 SIA-Replies sent/received: 0/0
 
 Moments later, you issue the same command a second time and the following output is   shown:
 
 RouterC#show ip eigrp traffic
 IP-EIGRP Traffic Statistics for process 1
 Hellos sent/received: 2139/2104
 Updates sent/received: 50/39
 Queries sent/received: 5/4
 Replies sent/received: 4/4
 Acks sent/received: 31/37
 Input queue high water mark 2, 0 drops
 SIA-Queries sent/received: 0/0
 SIA-Replies sent/received: 0/0
 
 Moments later, you issue the same command a third time and the following output is shown:
 
 RouterC#show ip eigrp traffic
 IP-EIGRP Traffic Statistics for process 1
 Hellos sent/received: 2162/2126
 Updates sent/received: 53/42
 Queries sent/received: 5/5
 Replies sent/received: 5/4
 Acks sent/received: 35/41
 Input queue high water mark 2, 0 drops
 SIA-Queries sent/received: 0/0
 SIA-Replies sent/received: 0/0

 What information can you determine about this network?
 
 A. The network is stable.
 B. There is a flapping link or interface, and router C knows an alternate path to the network.
 C. There is a flapping link or interface, and router C does not know an alternate path to the network.
 D. EIGRP is not working correctly on router C.
 E. There is not enough information to make a determination.
 
 
 Answer: B
  1. Q95: Refer to the exhibit. A partial routing configuration is shown. Complete the configuration so that only the default-network is redistributed from EIGRP 190 into EIGRP 212. Which ACL statement completes the configuration correctly? 
 router eigrp 190
 redistribute eigrp 212
 network 192.0.0.0 0.0.0.3
 !
 router eigrp 212
 redistribute eigrp 190 route-map default_route
 network 212.50.185.96 0.0.0.31
 !
 route-map defau1t_route permit 10
 match ip address 100
 
 A. access-list 100 permit ip 0.0.0.0 0.0.0.0 0.0.0.0 0.0.0.0
 B. access-list 100 permit ip host 0.0.0.0 any
 C. access-list 100 permit ip any host 0.0.0.0
 D. A default-network cannot be redistributed between routing processes.
 
 
 Answer: C
 
 Explanation
 
 The command “access-list 100 permit ip any host 0.0.0.0″ means permit any source address with the destination of 0.0.0.0/0, which is the default route
 
 Note:
 
 any equals 0.0.0.0 255.255.255.255
 
 host 0.0.0.0 equals 0.0.0.0 0.0.0.0

two

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