Comments on: CCNA – TCP/IP Model & Operation

By: Kabza

Kabza — Mon, 06 Jan 2014 11:37:09 +0000

sorry Guys i meant 640-802

By: Kabza

Kabza — Mon, 06 Jan 2014 11:35:19 +0000

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By: smashing top seo

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By: Question 11 Explanation error

Question 11 Explanation error — Fri, 18 Oct 2013 16:13:21 +0000

Further on the above, the only exception is when the router is acting as a proxy for another host, but even then, that host’s IP address still has to be within the local LAN address range.

By: Question 11 Explanation error

Question 11 Explanation error — Fri, 18 Oct 2013 16:10:38 +0000

In question 11, D it says ‘In fact, R1 drops that packet but it also learns that it is an ARP Request so R1 looks up its routing table to find a route to that destination. If it can find one, it will send an ARP Reply back for host A”.’

What would be the contents of that ARP reply? If the MAC address of remote host, that address will be useless on the local LAN. If the MAC address of the router, then it would also be useless, as host A, when it determines the destination is on another network uses the router MAC address, after associating the routers IP address with it. It will never associate any MAC address for a host that is not on the local network. So, such an ARP request should never be sent and even if it is, the router shouldn’t respond to it.

By: 9tut

9tut — Tue, 15 Oct 2013 13:29:26 +0000

@Question 3 Explanation error: Yes, thanks you for pointing out about the loopback 127.0.0.1. We have updated the explanation!

@Question 11 Explanation error: We don’t say routers pass ARP requests. We only say the router will reply the ARP Request.

By: Question 11 Explanation error

Question 11 Explanation error — Mon, 14 Oct 2013 17:16:26 +0000

Since when do routers pass ARP requests? ARP requests and replies are not IP. They’re a method to determine an IP address, but can also be used with other protocols. The only device that should respond to an ARP request is the device with the target IP or a proxy for it. Also, ARP replies return the MAC address of the destination and since MAC addresses are valid only on the local network, there’s absolutely no point in sending an ARP request through a router.

By: Question 3 Explanation error

Question 3 Explanation error — Mon, 14 Oct 2013 16:49:16 +0000

In the explanation, it states pinging 127.0.0.1 ping the network card. This is incorrect. Pinging 127.0.0.1 will work even if a network card is not present. It simply tests to the loop back, not the NIC. To test to the NIC, you have to ping it’s assigned address. Consider the situation with multiple NICs. If pinging 127.0.0.1 pings a NIC, which of the multiple NICs gets pinged?

By: ofir

ofir — Fri, 27 Sep 2013 08:29:36 +0000

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By: Konan

Konan — Sat, 21 Sep 2013 17:59:58 +0000

Please say why D i chosen as correct answer in Q8. C&D are the same commands,just first(i.e C ) short form of another one (i.e D).

By: Will

Will — Mon, 16 Sep 2013 20:40:32 +0000

I gotta take a dump with all these wanna-be test-takers asking for a the latest dump ;)

By: CiscoER

CiscoER — Thu, 12 Sep 2013 01:08:43 +0000

The answer for Ques 1 is correct – D E F allowed …. All that is being done here is blocking 21 23 25. The explicit deny comes AFTER the permit. Remember in ACL ordering is very important. So the deny ip any any will deny all other EXCEPT 21 23 25
** It’s a Rubicon**

By: Joe

Joe — Wed, 11 Sep 2013 18:16:27 +0000

‘question 1′ commenter, you’re wrong. It didn’t say there was only one line in the ACL. It said the purpose is to “deny packet entry for TCP and UDP ports 21, 23 and 25″. You must deduce that the ACL is correctly written to do just that.

By: Joe

Joe — Wed, 11 Sep 2013 13:55:56 +0000

MOSE, you’re wrong. It will not ARP for the host. C would work if the statement said ‘ARP for router’. The client will not ARP for the host if it knows the host is in a different network, it would only ARP for the router in the event it did not know the routers MAC.

By: jasostrong

jasostrong — Wed, 11 Sep 2013 13:27:45 +0000

Thanks 9tut. I made it. I passed my CCNA 200-120 today. The sim is Access-list 1 , Access-list 2 & EIGRP. A lot of new questions like Netflow, Syslog, SNMP, VRRP, and GLBP.

By: MOSE

MOSE — Wed, 11 Sep 2013 12:51:11 +0000

no 5 THE ANS IS B OR C

By: r0s

r0s — Tue, 10 Sep 2013 14:46:58 +0000

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By: question 1

question 1 — Thu, 05 Sep 2013 10:51:34 +0000

Nope.
Default action at the end of access-list is deny ip any any (implicit rule) so none of them are allowed.

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By: Dani

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By: den

den — Sat, 24 Aug 2013 22:38:05 +0000

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By: James

James — Thu, 22 Aug 2013 19:46:46 +0000

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By: Anonymous

Anonymous — Wed, 21 Aug 2013 20:13:14 +0000

Q, 9 and 10 were in exam today

By: brandon

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By: zain

zain — Mon, 19 Aug 2013 07:36:09 +0000

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By: Anonymous

Anonymous — Thu, 08 Aug 2013 16:54:21 +0000

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By: irfan

irfan — Mon, 05 Aug 2013 11:23:10 +0000

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By: Mike

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By: Henok

Henok — Thu, 25 Jul 2013 14:17:01 +0000

Q5, i think the answer is C, because the first action is ARP to get the default gateway MAC address.

By: Evaristo Ambriz

Evaristo Ambriz — Wed, 24 Jul 2013 15:15:32 +0000

q10, was in my exam

By: husein

husein — Thu, 18 Jul 2013 15:55:06 +0000

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By: Anonymous

Anonymous — Mon, 15 Jul 2013 22:20:51 +0000

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Anonymous — Mon, 08 Jul 2013 15:37:01 +0000

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kash — Wed, 03 Jul 2013 20:58:20 +0000

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By: beshoy

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By: Zubayer

Zubayer — Thu, 27 Jun 2013 12:27:03 +0000

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By: Great information...

Great information... — Wed, 19 Jun 2013 07:22:06 +0000

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By: Ryan T.

Ryan T. — Sat, 15 Jun 2013 09:49:32 +0000

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By: uzair

uzair — Fri, 14 Jun 2013 16:42:22 +0000

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By: kk

kk — Fri, 31 May 2013 15:46:43 +0000

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By: Bill Ado

Bill Ado — Thu, 30 May 2013 18:59:59 +0000

@Question, @Examtaker, @Blacky: C, D are correct
@Luisk: if you recall it correctly TCP and upper layers don’t use hardware (MAC Address) and logical address (IP Address) to understand the sending host’s address as the data link and network layer protocols do, instead, they use port numbers, what if the question was about http and port 80 being a choice, i’m pretty sure you’d have picked it as operating at transport layer, no my friend, transport is just a layer it goes through to get processed until reaches the right end

By: Faizul

Faizul — Thu, 30 May 2013 06:16:28 +0000

Awsome question Very helpful

By: luisk

luisk — Tue, 28 May 2013 03:08:42 +0000

@question @examtaker @blacky

All 3 are correct SSH does operate at a transport layer, it uses port 22 and is encrypted, all 3 options should be correct

It uses port port 22: http://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xml

If it uses port 22 according to the IANA it operates on both TCP and UDP which are transport layer protocols

I’ve spent a lot of time in research on cisco.com wikipedia, cisco books, but i couldn’t find clear information on how to discard one another

I read somewhere that SSH operates at an application layer as well… that i’m not 100 sure…

By: Anonymous

Anonymous — Fri, 24 May 2013 11:01:40 +0000

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By: David Okeri

David Okeri — Fri, 24 May 2013 09:33:34 +0000

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By: David Okeri

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By: Josh

Josh — Fri, 17 May 2013 16:52:54 +0000

Mina Rizkalla, on question 5.

What happens is this, host creates an ARP, when it get to the router, the routers says “I have a route to this Remote host, here, use my MAC to reach it”, so it sends frames to the default gateway, to then be redirected to corresponding host.

By: mista

mista — Sat, 11 May 2013 15:54:45 +0000

to sit this june

By: Zahid Ismail

Zahid Ismail — Sun, 05 May 2013 11:07:12 +0000

q10 in today exam

By: Mina Rizkalla

Mina Rizkalla — Fri, 03 May 2013 15:37:15 +0000

hey guys .. i don’t understand the question 5
Question 5

A host is attempting to send data to another host on a different network. What is the first action that the sending host will take?

i think that at first the encapsulation process takes place before sending the frames to the default gateway .. waiting for your replies guys

By: romedea

romedea — Sun, 28 Apr 2013 12:56:43 +0000

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By: Big Dr.

Big Dr. — Sat, 20 Apr 2013 18:59:04 +0000

Q9 WAS ON TODAY’S EXAM

By: blacky

blacky — Fri, 19 Apr 2013 17:09:43 +0000

@Question, examtaker
IMO, correct should be: C,D

Answer in dump just might be wrong.

By: examtaker

examtaker — Fri, 19 Apr 2013 13:26:23 +0000

@ question
i guess the correct answer to your question is C, D

By: C2

C2 — Fri, 19 Apr 2013 03:44:29 +0000

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By: Alex

Alex — Wed, 10 Apr 2013 00:40:24 +0000

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By: tt

tt — Sun, 07 Apr 2013 00:50:58 +0000

I need help to open the dump spike or shekter getting only 5 trial copy pls .

By: Question

Question — Thu, 04 Apr 2013 15:04:39 +0000

what do u think about this question ? This answer is not correct for me

What are two characteristics of SSH? (Choose two.)

A. most common remote-access method
B. unsecured
C. encrypted
D. uses port 22
E. operates at the transport layer

Ansswer : D,E

By: Joe - CCNP

Joe - CCNP — Fri, 29 Mar 2013 17:46:41 +0000

I have a problem with the second paragraph in Q11′s explanation. R1 will not ‘drop’ the ARP request. It will process it and reply if appropriate (like if it is the destination IP). It simply will not forward it out any other links since it is the broadcast domain boundary. The word drop is misleading. Typically the sending device knows – based on its own IP information – if a destination IP is on a different network and forward that packet to the gateway MAC.

By: Joe - CCNP

Joe - CCNP — Fri, 29 Mar 2013 17:27:50 +0000

I think the better explanation for Q2 answer E is that the configuration Cisco is talking about is the ‘transport input telnet’ command. If the configuration under the line is ‘transport input ssh’ or ‘transport input none’ then it won’t work. Talking about non TCP/IP stacks is a stretch…

By: bouba

bouba — Wed, 27 Mar 2013 16:20:09 +0000

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By: Me too

Me too — Thu, 21 Mar 2013 01:48:44 +0000

Question 10 on CCNA 2nd try today

By: mista

mista — Wed, 20 Mar 2013 09:35:46 +0000

A group of N users located in the same building are all using the same remote
com puter via an ATM network. The average user generates L lines of traffic
(input + out- put) per hour, on the average, with the mean line length being P
bytes, excluding the ATM headers. The packet carrier charges C cents per byte of
user data transported, plus X cents per hour for each ATM virtual circuit open.
Under what conditions is it cost effective to multiplex all N transport
connections onto the same ATM virtual circult, if such multiplexing adds 2 bytes
of data to each packet? Assume that even one ATM virtual circuit has enough
bandwidth for all the users.

By: Evgeny

Evgeny — Tue, 19 Mar 2013 23:26:11 +0000

MichaelI have a Billion 7301VGP router with my wileress printer frequently dropping off the LAN. With this model I could step through your solution to fix an IP address for my printer but got stuck at step 9. I don’t have an option Static ARP only Static Route and the step 11 and 12 choices are not listed. Where do I go from here?Thanks

By: Wolijam

Wolijam — Tue, 19 Mar 2013 23:07:11 +0000

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By: dilipp

dilipp — Tue, 19 Mar 2013 08:35:16 +0000

for Que 8, remember that ‘trace cisco.com’ is also a valid command, but the question is asked as ‘most appropriate’ command, hence only 4th traceroute cisco.com is the best answer. If the question was asked ‘select valid commands’ then 3, 4 will be the answer.
Router#trace?
traceroute
Router#trace cisco.com —-> will be valid

By: manfred kong

manfred kong — Sun, 17 Mar 2013 16:36:12 +0000

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By: med

med — Thu, 07 Mar 2013 11:54:16 +0000

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