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ROUTE Set 10

创建于: 2010-01-02 13:16:45          

Review Questions

The following review questions are taken from the current ROUTE curriculum. These review questions do not reflect the actual questions you will receive on the live certification exam. They are only meant to supplement your learning experience.

 

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评论 (20)
  • Chris Briggs

    Chris Briggs  说: 2010-12-31 02:08:16

    Since Cisco give the option of referencing prefix-lists via route-maps which can then be applied into distribution lists, it makes sense to enable prefix-lists to be applied directly. Trying to use ACL's to achieve the same level of effectiveness as a prefix-list for flitering is a lot more convoluted and so it's always my default choice (and is also more efficient for the router to process).

  • richard jackson

    richard jackson  说: 2010-12-31 01:45:37

    Interesting, I cannot find it documented anywhere but it shows up in one of our routers too.

    Dallas_WAN(config)#router eigrp 10
    Dallas_WAN(config-router)#distribute-list ?
    ? <1-199>????? IP access list number
    ? <1300-2699>? IP expanded access list number
    ? WORD???????? Access-list name
    ? gateway????? Filtering incoming updates based on gateway
    ? prefix?????? Filter prefixes in routing updates
    ? route-map??? Filter prefixes based on the route-map

  • Chris Briggs

    Chris Briggs  说: 2010-12-31 00:46:51

    Hi Richard,

    Technically, I see where you are coming from on Q.14, and as a veteran? of over 23 Cisco exams (all different!) familiarity helps with? comprehending 'Cisco-speak'. In this case, I don't have much issue? personally since External Type 2 is the default for redistribution into? OSPF therefore, in order to 'change' that the EIGRP 100 would have to be? set as External Type 1, but it is all a matter of interpretation. The? only correct answer is the Cisco answer howeverr ambigous that may be? :-)

    As for prefix-list distribution into EIGRP, I've used it many a time? when migrating MPLS customer networks so it is valid. Where did you read? otherwise? See below as an example from Cisco themselves.


    Q. I have two routes: 172.16.1.0/24 and 172.16.1.0/28. How can I deny 172.16.1.0/28 while I allow 172.16.1.0/24 in EIGRP?

    A. In order to do this you need to use a prefix-list as shown here:

    ??????? router eigrp 100
    ?????????????? network 172.16.0.0
    ?????????????? distribute-list prefix test in
    ?????????????? auto-summary
    ?????????????? no eigrp log-neighbor-changes
    ?????????????? !
    ?????????????? ip prefix-list test seq 5 permit 172.16.1.0/24

    This allows only the 172.16.1.0/24 prefix and therefore denies 172.16.1.0/28.

  • richard jackson

    richard jackson  说: 2010-12-30 23:57:42

    Chris, on Q14 I was stuck on the phrase "changes the metric type".? It does not literally "change" the metric type.? It sets it to 1 instead of setting it to 2 while converting the EIGRP metric into an OSPF metric. It was never set to 2 so it is not being changed.?

    The specific wording of the questions is so important, so often, that when they get careless like this it is really frustrating.

  • richard jackson

    richard jackson  说: 2010-12-30 23:29:24

    The distribute list command only allows prefix lists in bgp.?? The old Route test did not include bgp so maybe this question is a carry over from the old test when their answer would be correct.

  • Chris Briggs

    Chris Briggs  说: 2010-12-30 19:48:30

    For Q.13, you can essentially redistribute any routing process into any other, be it interface (connected), statically or dynamically configured AND they are of the same protocol family, i.e. IPv4 or IPv6.

    For Q.14, non-OSPF routing processes redistributed into OSPF are marked as E2 by default. Therefore, the eigrp 100 subnets metric-type 1 command will convert the EIGRP 100 routes into E1. You might want to do this when you want the total cost of reaching the EIGRP 100 routes to be included up to the redistributing router, otherwise an E2 route will only incude its cost up to the ASBR it entered from.

  • Chris Briggs

    Chris Briggs  说: 2010-12-30 19:31:33

    I use prefix-lists within distribute-lists all the time so the answer in 6 should be ACLS, prefix-lists and route-maps.

  • Chris Briggs

    Chris Briggs  说: 2010-12-30 19:23:46

    The official CCNP ROUTE book is correct: 0.0.0/0 le 32 matches ALL routes.between mask lengths of 0 and 32, therefore both the book AND Peter's answer above are correct.

  • Breland Rogers

    Breland Rogers  说: 2010-12-27 08:13:23

    I agree, the book says le32 not ge32

  • jgmarrcuba

    jgmarrcuba  说: 2010-12-17 22:51:47

    Any answer about question number 6? I am studing to take CCNP routing exam. Look like this three answer are true.

    access lists

    prefix lists

    route maps

    Best regards.

  • sch.netadmin

    sch.netadmin  说: 2010-12-15 10:01:18

    6.? Which two tools can be used to match traffic controlled by a distribute list? (Choose two)
    ????????

    ???? access lists

    ???? prefix lists

    ???? route maps ...

    Cant all 3 of these be used to control traffic in a distribute list?

  • Peter

    Peter  说: 2010-12-05 22:19:05

    In Question number 5 they are asking for HOST routes not ALL? routes. That is why the ge 32 is the correct one. le 32 would match ALL routes, not only host routes.

    cheers!

  • arbjork

    arbjork  说: 2010-12-03 12:22:16

    seriously ?

    5. Which prefix list matches all host routes?

    ip prefix-list A permit 0.0.0.0/0 ge 32

    ???

  • ginar

    ginar  说: 2010-08-02 18:23:00

    You are correct. I suggest they have a look at this question again.

    We can use le to create an entry to match "any" prefix: 0.0.0.0/0 le 32 matches any prefix with a length between 0 and 32 bits (inclusive). This matches all possible IPv4 prefixes.

  • Lars Arvidsson

    Lars Arvidsson  说: 2010-07-06 17:18:29

    I think the correct answer to question 5 in fact is:

    ?? ip prefix-list C permit 0.0.0.0/0 ge 32

    As I understand it "ip prefix-list C permit 0.0.0.0/0 le 32" match all routes while "ip prefix-list C permit 0.0.0.0/0 ge 32" match all HOST routes, i e only entries with a 32 bit prefix.

  • cessnaflyer

    cessnaflyer  说: 2010-06-16 05:53:42

    Joao: Not that my opinion matters, but I think you're right.? I would think the answer to #5 "Which prefix list matches all host routes?" is "ip prefix-list C permit 0.0.0.0/0 le 32".

    Anybody have any idea as to why the answer would be listed as "ip prefix-list A permit 0.0.0.0/0 ge 32"?

  • Joao Ferreira

    Joao Ferreira  说: 2010-06-01 22:55:44

    Sory but just another question...

    in 6 we have:

    6. Which two tools can be used to match traffic controlled by a distribute list? (Choose two)

    Corrects are: Access Lists and Route-maps

    but... it have the prefix-lists in possible awnsers too

    According to the same book (CCNP ROUTE from cisco press and comproved in practice) we can use prefix-list , route-maps and ACL in distribute-lists...

    Router(config-router)#distribute-list ?
    ? <1-199>????? IP access list number
    ? <1300-2699>? IP expanded access list number
    ? WORD???????? Access-list name
    ? gateway????? Filtering incoming updates based on gateway
    ? prefix?????? Filter prefixes in routing updates
    ? route-map??? Filter prefixes based on the route-map

    Is there a bug in question?

  • Joao Ferreira

    Joao Ferreira  说: 2010-06-01 22:42:02

    In question 5. We have:

    5. Which prefix list matches all host routes?

    correct answer: ip prefix-list C permit 0.0.0.0/0 ge 32

    But it just match a specific route 0.0.0.0/32 Why not answer C:

    ip prefix-list C permit 0.0.0.0/0 le 32

    that willl match all prefixes?

    Acording to CCNP ROUTE book, we have:

    ip prefix-list something permit 0.0.0.0/0 le 32 for match everything...


    I'm thinking right or I'm confused ?

    Thks

  • Lars Arvidsson

    Lars Arvidsson  说: 2010-05-26 23:10:27

    Next Generation Enterprise Branch Security System Assurance Guide

    They both seem OK to me.

    13. Redistribution supports BGP, EIGRP, IS-IS, OSPF, RIP, static, and connected routes.

    - This is True.

    14. What does the redistribute eigrp 100 subnets metric-type 1 command do when used in router configuration mode under OSPF process 1?

    - Redistributes from EIGRP AS 100 into OSPF and changes the metric type from type 2 to type 1.

  • richard jackson

    richard jackson  说: 2010-04-10 05:39:28

    not sure about 13 or 14.