Hi all,

This is extracted from my ICND 1 text book.

I?m unclear what the 3 bullet points as below mean. Can I request some explanation how the destination IP addresses match all the routes?

Thank you in advanced.

Example 15-2 show ip route Command with Overlapping Routes

R1#show ip route rip
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 5 subnets, 4 masks
R 172.16.1.1/32 [120/1] via 172.16.25.2, 00:00:04, Serial0/1/1
R 172.16.1.0/24 [120/2] via 172.16.25.129, 00:00:09, Serial0/1/0
R 172.16.0.0/22 [120/1] via 172.16.25.2, 00:00:04, Serial0/1/1
R 172.16.0.0/16 [120/2] via 172.16.25.129, 00:00:09, Serial0/1/0
R 0.0.0.0/0 [120/3] via 172.16.25.129, 00:00:09, Serial0/1/0
R1#show ip route 172.16.4.3
Routing entry for 172.16.0.0/16
Known via "rip", distance 120, metric 2
Redistributing via rip
Last update from 172.16.25.129 on Serial0/1/0, 00:00:19 ago
Routing Descriptor Blocks:
* 172.16.25.129, from 172.16.25.129, 00:00:19 ago, via Serial0/1/0
Route metric is 2, traffic share count is 1

For the exam, to find the matching route, all you need to know is the destination IP address
of the packet and the router?s IP routing table. By examining each subnet and mask in the routing table, you can determine the range of IP addresses in each subnet. Then, you can compare the packet?s destination to the ranges of addresses, and find all matching routes.
In cases where a particular destination IP address falls within the IP address range for multiple routes, then you pick the route with the longest prefix length. In this case:

■ Destination address 172.16.1.1 matches all five routes, but the host route for specific
IP address 172.16.1.1, prefix length /32, has the longest prefix length.

■ Destination address 172.16.1.2 matches four of the routes (all except the host route for
172.16.1.1), but the route to 172.16.1.0/24 has the longest prefix.

■ Destination address 172.16.2.2 matches the last three routes listed in R1?s routing table
in the example, with the route for 172.16.0.0/22 having the longest prefix length.

■ Destination address 172.16.4.3 matches the last two routes listed in R1?s routing table in the example, with the route for 172.16.0.0/16 having the longest prefix length.

Finally, note the output of the show ip route 172.16.4.3 command at the end of Example
15-2. This command shows which route the router would match to reach IP address
172.16.4.3?a very handy command for both real life and for Sim questions on the exams.
In this case, a packet sent to IP address 172.16.4.3 would match the route for the entire
Class B network 172.16.0.0/16, as highlighted near the end of the example.

Hi,

  I'm currently taking CCNA courses but was recently stuck with STP. To be exact, I'm not stuck with what it does, just some protocols related to it.

  So far, I understand that RSTP is much faster than STP. PVST+ is composed of PortFast, BackboneFast, and UplinkFast. But then, I was stuck by the relationship between RSTP, PVST+, and PVRST+. The review book I'm using (CCNA Exam Cram) tells me that "A Cisco Catalyst switch running PVST+ or PVRST+ maintains an instance of spanning tree for each active VLAN that is configured on the switch.", which I currently have no idea what it means. Please guide me out of this mess, thanks.

  Also, the Trunking part is kind of ambiguous, so to speak. What exactly is a trunk? is it just a protocol (that would be 802.1Q or ISL, right?) or hardware (cross-over cable?)?

I just passed the composite (640-802) exam with a score of 874 (not a good score). I missed  (something really simple) out on a simulation (NAT), and if I had successfully finished it , then my score might have been a little over 900. Never the less, H2P has been a great help!

Thanks to everyone who had help me on this forum.

1)Refer to the exhibit. Routers R1 and R2 are directly connected via interface Serial0/0 on each router but they are unable to communicate. What could be the cause of the problem?

A - The MTU is too high on both routers.
B - The routers are not on the same network.
C - A loopback address is required on both routers.
D - The routers are not using the same encapsulation.
E - Both interfaces require a no shutdown command to be issued.
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2)Refer to the exhibit. When following best practices for ACL placement, where should the ACL 101 be placed in order to minimize traffic and router overhead?

A -inbound on R1 Fa0/0
D - inbound on R3 Fa0/0
C - inbound on R3 Fa0/1
D - outbound on R1 Fa0/0
E - outbound on R1 Fa0/1
F - outbound on R3 Fa0/0

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3)Refer to the exhibit. What range of IP addresses would match this ACL statement?

A - 10.100.0.0 - 10.100.0.15
B - 10.100.0.0 - 10.100.0.207
C - 10.100.0.192 - 10.100.0.207
D - 10.100.0.192 - 10.100.0.215
E - 10.100.0.192 - 10.100.0.240


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4)Refer to the exhibit. In order to establish a default route to the ISP, which two commands need to be issued on R2 so that R1 receives a default route from R2? (Choose two.)

A - R2(config-router)# area 0 range 0.0.0.0 0.0.0.0
B - R2(config)# ip default-gateway 209.165.201.1
C - R2(config-router)# default-information originate
D - R2(config)# ip route 0.0.0.0 0.0.0.0 209.165.201.2
E - R2(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/1
F - R2(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0

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5) Refer to the exhibit. A network administrator enters the command ip route 10.10.4.16 255.255.255.248 s0/0/1 into the router. What will be the result of this configuration?
A - A static route pointing to 10.10.4.16/29 is placed into the routing table.
B - A static route to 10.10.4.16/29 is placed into the routing table if interface FastEthernet0/1 goes down.
C - A static route pointing to 10.10.4.16/29 is only placed into the routing table if the route to 10.10.4.0 is removed.
D - A static route is not placed into the routing table because a RIP route that includes the destination network already exists.


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6) Refer to the exhibit. Routers R1 and R2 cannot communicate. What could be the cause of the problem?
A - Usernames on both routers R1 and R2 are misconfigured.
B - The passwords are identical on both routers.
C - The encapsulation command is entered incorrectly.
D - The IP addressing scheme has incorrect subnet masks.


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7)Refer to the exhibit. Traffic from which network will be translated into a single public IP address?
A - 10.0.0.0/24
B - 192.168.0.0/23
C - 192.168.1.0/24
D - 192.168.2.0/24
E - 192.168.3.0/24

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8) An administrator is configuring a new router to permit out-of-band management access. Which set of commands will allow the required login using a password of cisco?
A - Router(config)# line vty 0 4
Router(config-line)# password manage
Router(config-line)# exit
Router(config)# enable password cisco

B - Router(config)# line vty 0 4
Router(config-line)# password cisco
Router(config-line)# login

C - Router(config)# line console 0
Router(config-line)# password cisco
Router(config-line)# login

D - Router(config)# line console 0
Router(config-line)# password cisco
Router(config-line)# exit
Router(config)# service password-encryption

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I am interested in the CCNA.  I have no network experience.  I have 10 years of experience as a security application developer/tech lead.  I am a CISSP and a CISA.

As we all know security is required in both the application and network layers.  My overall goal is to understand what security is required and how it gets implemented at the network layer.  I would never do the actual implementation but would interface with those who do.

I was thinking that I would merely read a few network books but then I thought why not go for the actual certification.

Does anybody have any thoughts, how much work would it be to get the CCNA (with no exp) and is it even worth it given my goals ?

Thanks in advance for any comments

thank god. i thought i will fail this exam. really give up at the final question but the result really awesome. i got 3 labs. ospf virtual link, eigrp stub & redistribte ISIS<->EIGRP. thanks a lot h2p. good luck for everyone

I would like to thank H2P for their hard work in this website, and I want to thank our members who shares their knowledge with us.

The test was hard today but i made it with 869, good luck to everyone.

I'm posting this in hopes that others don't make my mistake.

I'm trying to get my CCNA again. It expired in 2007. I went to Cisco's website and it said that you need to only take the ICND 2 exam to recertify. So that's what I did. I passed the ICND 2 exam (thank you How2pass!!!) and then waited about a month to get my certificate.

It didn't come. So I called Cisco and inquired. They said that I have to start over because my previous certification expired. The only thing the woman on the phone could do for me is submit a recommendation to the website people that they be more explicit on the website.

In my opinion, their website SHOULD say.... "If your previous certification has expired, you will need to pass the full exam. If it has not expired, you need only to pass the ICND 2, or ......".

So be careful everyone and GOOD LUCK TESTING!!!!

Hi All

I passed the BSCI exam today, i got 893.

I didnt get much on BGP which i thought i would. I did however get quite a lot on ipv6 and OSPFv2 and v3.

I got 3 sims: Redistribution, OSPFv3 virtual links & EIGRP summarisation. The OSPFv3 virtual links & EIGRP summarisation were spot on but the redistribution was a little different.

Two things. The metric for ISIS was to be 57 not 50 and also EIGRP routes int ISIS had to be level-1 only.

How2Pass is great, ive used them for CCNA, ONT and now BSCI and they are all spot on. I got a couple of new questions but they were not hard and if you know the routing protocols then the answers are easy.

Id definately recomend people look at IPv6 and multicast these were areas that seemed to come up alot. I think Cisco are starting to realise that IPv6 is going to be a big thing.

Good luck to anyone else taking the exam.

Is there any quick and sure fire way to tell if an IPv6 address is valid or not. I know it ask this question at least once during the exam and I recognize the IPv6 loop back but a normal host address is a little more difficult to tell if it is valid or not. I am also aware that if it has any hexadecimal character above a f it isn't valid, but I really need some good solid info on how to determine quickly if an IPv6 address is valid or not. Thanks,