ARP Testlet

for question 4, testking says that the OSI Application layer is what keeps the correct info in each web browser.. this page says that it is the port numbers. which is it? i’ve searched on google to try to find an explanation, but haven’t come up with anything. i did see this exact question on my test last friday… i failed by a handful of points and have a retake thursday morning.

Steve … it is the port numbers that keep those sessions in order. So if you have a yahoo.com page open, google.com open, and amazon.com open the TCP ports (socketing) keep the information going to their correct window.

It is the fact that it is an HTTP window/server that you are trying to open so when DNS resolves that webpage name that you put into the browser window it puts the port number of 80 (being http) onto the end of the IP address so that server knows it is the http portion of the server that you are trying to contact.
So yahoo.com for instance… its name resolves to 69.147.114.224 … and then for the socketing of the port number would make it 69.147.114.224:80.
The IP address of your PC has a dynamic port number added onto it from Windows. So it might be something like 192.168.1.5:4560 (or whatever number the OS puts on there) for each window that you have open that dynamic port number will be a different value, so the next window you have open might be 192.168.1.5:4561
This is how the sessions are kept straight so they go to the proper window. I believe those terms to explain it better would be TCP Sockets or I think also session multiplexing, but I cannot remember exactly.

9tut, I had a question in the test I took two days ago, what would the switch do if the both the source and destination mac addresses are not in the mac-table ?
please advise.

@ Jay
If the source address is not in the mac (or cam) table, the switch adds it to the table along with the interface on with the packet was received on. If the destination address is also not in the table, the switch will flood the packet out all interfaces except the interface on which that packet was received.

@Ciaran
Your are corret. But the question is listed like this:
The mac table has three mac addresses. for example (A,B,C)
then the question asks what would the switch do if it recieves:
mac address D as a source and
mac address F as a destination
(you have to pick two answers out of five)

@Ciaran
Your are corret. But the question is listed like this:
The mac table has three mac addresses. for example (A,B,C)
then the question asks what would the switch do if it recieves:
mac address D as a source and
mac address F as a destination
(you have to pick two answers out of five)

@Jay

You mean..
MAC table hads entry for A,B,C.
In coming packet source was D and distination was F?
In that case like Ciaran said
1/ router will flood message to all port except packet source ( which is D situated)
2/ router will update packet source MAC address D to it’s MAC table.

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The answer to what steve posted on February 10th, 2010:

it’s a trick answer. The Transport layer of the OSI model is responsible for source & destination port assignments, not the Application layer.

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Passed ICND1 today with 962…..I didn’t get this ARP testlet on my exam.

Studied with:
Odom ICND1 Book
Todd Lamle CCNA book
Chris Bryant (thebryantadvantage.com)

I didn’t get this questions but there were a lot of questions about the frames that it would be when a PC sends or ping another PC.
Destination MAC address and Source MAC address.

I remember that one question was that what will be the MAC address inside a frame in a ARP when a PC is powered on by first time and it pings another PC. The answer is ff.ff.ff.ff.ff.ff

The above topology is understandable but I have just one question. In question 1, since Host F is trying to reach the Server, and obviously since it’s on a different Lan, when it wants to send a packet to the Server how would it have it’s IP address? It first get’s it’s Mac address from the SFX Router Gateway, I understand that, but how did it get the IP address of the Server? Or does Router SFX always have it??

@bigd
there are 2 ways: you either know the IP from the start or you know the name of the site and you use a DNS server to translate the name to an IP.

short answer: host F knew the IP of the server from the beginning

@Xallax, Thank you.

always a pleasure

@Xallax, taking the exam next week.

@bigd
have you gone through testout’s training? watched the cbt nuggets series for ICND1? read todd lammle’s book? read all the tutorials on 9tut.net?

@ Xallax, Didn’t read Lammle’s book, but I read Cisco Press, I did watch CBT Nuggets and went through this site on a daily basis, as you know. Am I missing something, tutorials?? I read the Q&A’s , if there is something else please let me know. Thanks

@ Xallax, Testout??

@Xallax, didn’t I give that to you last time? If you can not find I will send it to you again. I don’t like to post on this or any other site if I can avoid it.

Look @ ICND experience back to Aug 18.

I’d like to cancel a cheque

Question 2.
I think we need to correct the solution part to ……..
Source addresses: the IP address of host F and the MAC address of host F
Destination addresses: the IP address of WWW server and the MAC address of SFX server

It should be SFX Router and not SFX server. Really important to know.

@Bruno: Yes, thanks for your detection. I updated it!

Is there any source that explains exactly what happens to a packet at different intervals, the header change etc. For example when it hits a switch or router, does the header change and it if does, why? Little bit out of my depth with this section. Thanks

hello!please anyone can send me the new dump? my email is (posso6@yahoo.com)

hello sir,
i want take ccna exam so pls tell me sugestions

Has anyone sat the exam recently? was there many (if any) questions on IPv6?

necr0sys:

Always remember that a frame changes at each hop, but the packet (i.e. source and destination IP address) is never changed or manipulated in any way until it reaches the destination device. MAC addresses are always local. A MAC address will only be used on a local LAN. It will never pass a router’s interface.

For a host to send packets to individual hosts on a local network as well as transmit packets between routers, the Data Link layer uses hardware addressing (MAC addresses). Each time a packet is sent between routers, it’s framed with control information at the Data Link layer (source and destination MAC address), but that information is stripped off at the receiving router and only the original packet is left completely intact. This framing of the packet continues for each hop until the packet is finally delivered to the correct receiving host. It’s really important to understand that the packet itself is never altered along the route; it’s only encapsulated with the type of control information required for it to be properly passed on to the different media types.

The last paragraph came from Lammle’s CCNA Study Guide (6th ed).

There “shouldn’t” be any questions on IPv6 since that isn’t in the list of topics for ICND1 (it is for ICND2).

@hikerdude
yes, they are for ICND2, but you should read about IPv6 at least once. knowledge is power

I am not sure that the answer in Question 4 is correct!?!?

——
Host F is displaying two World Wide Web documents from the WWW server in two browser windows at the same time. How did the data find its way to the correct browser windows?

“C – TCP port numbers are used to direct the data to the correct application window.”
——

In fact HTTP communication is all made on TCP port 80. Which means that it is the SESSION layer that handles this type of communication, which leads that either there is a missing answer here or otherwise the answer here is “B – The browsers track the data by the URL.”

@spirit
nope
the traffic from the host originated on port 12345 and went to port 80 on the web server
then a new browser window was opened and pointed to the web server. the packages had a source port number of 32145 and went on port 80.

you are correct when you say that the communication is done on port 80. the DESTINATION is port 80.
the SOURCE is a number chosen by the host operating system in the range of 1024 ~ 65535 (if i recall right).

happy holidays

Oh yes yes… thank you for reminding me that 🙂
I forgot that every time a new session is made that chooses a different source port number > 1024.

SPECIAL THANKS to 9TUT.COM which made it possible for me to pass the ICND1 exam. I am now moving to ICND2.

Accountant supermarket manager

I’ll send you a text

Passed ICND1 today. Did not get this on the exam.

i am taking text soon any one can help me for new dump ICND1 posso6@yahoo.com

passed my CCENT. here are things i still remember from my test.
1. know port numbers, eg DNS=53, etc
2. subnetiing, subnetting, subnetting!!!!!!!!!!!!!!!!!!! i had about upto 10 qns related to subnetting.
3.know how data moves across the network. know that the source and destination address never change as a packet traverse the network. its the mac addresses that change during data transportation. know what happens if a host ARPs for the firt time
4.you have to know how to use CDP command and various show commands other than sho run/start.
5.drag and drop: Frame relay=Packect switched,
PPP=leased line,
ATM=cell switched
PSTN=circuit switched
6.be comfortable with the command line, either confoguring or running some show commands
7.the Security testlet was there in my exam, know it

Wish the best of Luck.

Had this exact testlet on my test today along with the switch/router security sim and this drag and drop from the ccna site. http://www.9tut.com/65-ccna-drag-and-drop-sim-question

Passed today (23rd March) with 936. This question was in the exam.

passed it today this question was in it

I’ve just started at

Wonderfull great site

Had this one on mines. Passed 9/23/12 with a 974. This website is awesome and is a great representation of whats on the test. I had the DORA drag and drop, and also the WAN protocol DAD. The security testlet was on there. Chose banner as part of my answers and got 100% in that area. I had lots of subnetting questions, so if you are not comfortable with subnetting, practice. For studying I used this site, cisco (for the subnetting game, and also went through their review questions), and attended a CCNA course at a certified cisco learning partner. Also had the implementation drag and drop. thanks 9tut, on to ICND2. Good luck everyone.

Question 3: The frame has been received by the ILM router and is to be delivered on the local LAN. Which two statements describe the addressing of the Ethernet frame that has been created by the ILM router ?
One of the answer is : The destination address will be the MAC address of the WWW server.
My confusion is how the Router ILM will know the mac address of the server WWW which is across the Switch A to feed into the destination Mac address field in the Ethernet frame? Does Routers keeps a table for Mac addresses of all nodes in the Network?
I am sorry if I am unaware of something that is missing here. An explanation would be very helpful. Thanks in advance.

subh yes there is a mac address table. host use ARP to learn each other’s mac addresses. its ok if you dont know this yet. it just means that you havent reached that part in your studies yet. usually these concepts are discussed in the switching section of what ever material your using. as long as your studying more than just the dumps you’ll be ok.

I know that Routers uses Routing table to switch packets between Networks and Switch uses Mac-address or CAM table to forward frames to destination Mac address or device. What I am not getting is: how the Router ILM gets the Mac address of the server WWW? I know how ARP works, what I am assuming here is: The Router ILM, to learn the Mac address of the Server WWW, sends an ARP request on the Network with the IP address of Server WWW. On getting the ARP request the Server replies back with its Mac address and that is how the Router gets the destination Mac address. Please correct me if I am wrong. Does ARP table has something to do here?

it starts when host F request a webpage (ex: yahoo.com) from WWW server. DNS converts the domain name (yahoo.com) to an ip address 98.139.183.24 and it becomes the destination ip. ILM router then uses the destination ip address to ARP and find the mac associated with. then ILM forwards request to WWW server.

in all honesty you really should be learning what i’m telling you on your own. are you reading any books or watching any videos. these are very basic questions and they are not difficult to learn but you have to study them. if you don’t know the answers to the questions your asking that means that you have to review your study material. you can get help on this site but we cant teach you networking.

I appreciate that you replied to my question and now my doubt is clear. Thanks for that!! But I am not seeking to LEARN Networking here, I had a doubt and wanted to clear it. Is it really necessary to be rude while replying? If you consider this too trivial to ask then you may just ignore it. I thought this medium is to help each other and not undermine the knowledge of the person putting up a question. I have referred Odem, TestOut, CBTNuggets and I do not feel they are too tough to understand. Its just that I somehow missed to understand this part or may be just overlooked it. Please try be nice next time. Will not harm..

my apologies subh. it wasnt my intention to be rude. i’m a very direct person and on the internet -with only written text to go by- its easy to be mean and cold-hearted , or unintentionally come across that way. i said to you the same things i say to a friend in-person. although i could have said it in a more pleasant manor, encouraging you to study was not an attempt to undermine your knowledge. i do agree with your comments and i will accept your advice. thank you.

@there … apology accepted 🙂 you will be my hero here from now on… 🙂 I can definitely understand now what you were trying to say and I too completely agree with you on the fact that without studying and only going by dumps is not worth trying this exam. I must say that you are a very humble person to have replied to my comment which was, to an extent, rude as well. Given the fact that you answered to my question at a time when I was putting a lot of effort into the exam preparation so it ticked me off.. but I know now that you didn’t meant it that way and please also accept my apology for being rude as well. Peace!!

Passed my ICND1 on the 13th with 950 this question was on the Test. Thanks 9tut you guys helped alot. Can remember if any of these were on the exam

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I am totally having some unfortunate luck with all of my Cisco attempts for 640-802 and then stepping down to doing the two part 640-822 and 640-166. On my last two failed attempts with the 802 exam, I failed both exams by 10 points which caused me to go hysterical. When I decided to go for the 640-822 test, I studied hard for another 3 weeks with all sorts of tools provided:
– Leadpass
– CBT Nuggets
– Testout
– Boson 7.0 Netsim
– ITU
– Cisco Press ICND1 book by Wendell Odom
– Cisco Packet Tracer
– 9tut
– ExamCollection
– VCE
– subnettingquestions.org
and I still ended up failing for with a 775/1000. I was for sure that I passed the exam when I was killing all of my practice material. I definitely do not know what is going on and this is extremely disturbing. I keep seeing others with great success stories, and I’m trying to reach that pinnacle also to relay my experiences, but damn, I’m in a hole I can’t get out of. Can anyone out there feed me some of the latest dumps for the ICND1 exam. I would definitely appreciate this as I’m trying to be a family member in the Cisco world.
I can be reached easily at cehiem@yahoo.com…

don’t worry Dallas next time you will be passed.
” failure is not fatal: it is the courage to continue that counts …”

m1247u http://www.tqpKgjANtqAZd6lOpqyOU9ONxzANyMQF.com

Failure is expensive. Not fatal 🙂

DHCP DORA is a great tip. What does WAN DAD mean?

Hi Jan,

Hard luck on the exam. I have mine tomorrow and feel pretty under prepared. Were any of the config questions on this website? You will have to pay for the exam again and have to wait now 5 working days to resit as far as I’m aware.

kind regards,

Chris

Great prap for this topic..

Anyone get this one recently? Taking test tomorrow.

To all those who failed, you’re not alone. I already failed the CCNA twice now. Going to break it up this time and try for the CCENT and then the CCNA. The lead2pass VCE’s, 9tut, packet tracer are helping a lot along with CBT Nuggests videos.

I came here to work

I’m about to run out of credit

I’m doing an internship

Hello, I’m confused on question 3. One of the answers is “B – The destination address will be the MAC address of the WWW server” If this is originating from router ILM and ultimately destined for the WWW server which is directly connected to Switch A then wouldnt the destination MAC be that of the FA 0/0 interface Switch A?

@Michael
Yes, I agree with you about question 3. I believe the correct answers should be A and E.

**Correction**
Ignore my previous comment. In this case, I do not believe that the ports on Switch A are supposed to have their own MAC addresses. The switch merely determines which connected device (router, host, server, etc.) is located at which port by matching the MAC of those devices to its own switchports in its MAC address table.
Question 3 answers are:
B E (as originally stated)

I’m with you guys on this @Michael and Alfie. I just figured since it hadn’t been addressed before the fault was my own but I can’t figure out why that would be. The destination/source IPs don’t change, but the MAC destination and source changes at every hop between switch, router, server, etc. At least that’s how I’ve come to understand it. I’d appreciate clarification on this, whether I’m correct or not – just looking for the truth in this scenario. Thanks.

Alright. Well after some searching, it appears B and E are viable, the router doesn’t necessarily have to use the switch as the next MAC destination if it does have the MAC in the CAM, and in this scenario it does because the host has already received a reply from the server. The source MAC would change from the router to the switch on the way to the server, but destination MAC doesn’t have to. Hope this helps.

The reason that the destination MAC address is not the MAC address of the Switch is because the Switch would think that the frame is going to the SWITCH and not the SERVER. The Switch does NOT forward traffic based on IP addresses. The Switch does however know which port the MAC address of the Server is on. Therefore the destination MAC address of the Server is required when sending a frame from the Router to the Server. I hope I was able to clarify this for you!

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