WAN Questions
Here you will find answers to WAN Questions
Question 1
As a network technician, you must know the various layers of the OSI model. At which layers of the OSI Model do Wide Area Networks operate in? (Choose two)
A. Physical Layer
B. Datalink Layer
C. Network Layer
D. Session Layer
E. Transport Layer
F. Presentation Layer
G. Application Layer
Answer: A B
Explanation
Frame Relay is a high-performance WAN protocol that operates at the physical and data link layers of the OSI reference model.
Question 2
Network equipment supporting the use of flow control mechanisms has been recently installed in the network. What is the purpose of flow control in a data network?
A. It ensures that data is retransmitted if an acknowledgment is not received.
B. It reassembles segments in the correct order on the destination device.
C. It provides a mechanism for the receiver to control the transmission speed.
D. It regulates the size of each datagram segment.
E. All of the above are functions of flow control
Answer: C
Explanation
Flow control is the process that control the rates at which data is transferred between two endpoints, enabling a receiving device to signal congestion to a sending device, which allows for the sending device to temporarily halt transmission, alleviating congestion at the receiving device.
Question 3
You are a network administrator working in the communication company. One day, you find that the encapsulation has been altered by someone on a synchronous serial line and this new configuration is not the optimal one. So you attempt to return the encapsulation to the default. Which measure will you take to reach this goal?
A. Issue the shutdown then no shutdown commands to reset the encapsulation on the interface.
B. Reboot the router and allow it to reload the configuration.
C. Configure the interface for HDLC encapsulation.
D. Change the encapsulation to ARPA.
Answer: C
Explanation
We can’t use the “shutdown” & “no shutdown” commands to reset the encapsulation because it doesn’t affect the encapsulation type -> A is not correct.
Reboot the router and reload the configuration can solve this problem but other configuration will be erased too -> not a good choice.
The question asks “attempt to return the encapsulation to the default” and the default encapsulation on a Cisco router is HDLC so we can configure the interface for HDLC encapsulation -> C is the correct.
D is not correct as ARPA is not the default WAN encapsulation of a Cisco router. ARPA is the standard Ethernet version 2.0 encapsulation.
Question 4
During your interview for a network administrator job, your interviewer gives you some statements to judge. The following options are all related to the configuration of a serial link on a Cisco router. You should point out which one is the correct. What is your answer?
A. The clock rate command is a requirement for DCE interfaces.
B. If the clock rate command is configured, then the bandwidth command is required.
C. If the bandwidth command is configured, then the clock rate command is required.
D. Cisco routers are DCE devices.
Answer: A
Explanation
The purpose of DCE equipment is to provide clocking and switching services in a network. Clock rate doesn’t have a default value so we have to configure it manually (while bandwidth does have a default value). Cisco routers can be configured as DTE or DCE devices.
Question 5
As a network technician, you should know how to gain information from the exhibit. According to the command output displayed in the following exhibit, please point out the correct description about interface Serial 0/0/0.
Exhibit
| Router#show running-config Building configuration Current configuration :59 bytes <output omitted> interface Serial0/0/0 |
A. The configuration is incomplete, which will cause the interface status to be “Serial0/0/0 is down, line protocol is down”
B. The interface is using Cisco HDLC for layer 2 encapsulation.
C. The configuration is incomplete, which will cause the interface status to be “Serial0/0/0 is up, line protocol is down”.
D. A ping to the remote address 209.165.200.226 will be successful.
Answer: B
Explanation
The configuration is correct and the “no shutdown” command was used (because we don’t see a “shutdown” line in the output) so we can see at least “Serial0/0/0 is up” -> A is not correct.
Although the configuration is correct but we don’t know if this interface is connected with another router or not. If it is connected with another interface (on another router) and that interface is up, we will see the “Serial0/0/0 is up, line protocol is up”. Otherwise we will see “Serial0/0/0 is up, line protocol is down” -> we can’t guarantee answer C is correct.
Answer D is the same with C because we don’t know if the remote interface 209.165.200.226 exists (and turned up) or not.
For WAN interface (serial interface), the default layer 2 encapsulation is HDLC -> B is correct.
Question 6
| Router2#show interface serial 0/0 Serial0/0 is up, line protocol is down Hardware is PowerQUICC Serial Internet address is 172.16.10.1/30 MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec, rely 255/255 load 1/255 Encapsulation HDLC, loopback not set, keepalive set (10 sec) <output omitted> |
You work as a network administrator. You study the exhibits carefully. The corporate office and branch office have been attached through two non-Cisco routers over a highly reliable WAN connection over a year. A new Cisco router has been installed to replace the hardware at the branch location. Since the installation, IP communication cannot be verified across the link.
Given the output on router R1, what could be a logical first step to take to resolve this problem?
A. Ensure an exact match between the bandwidth setting on Router1 and Router2
B. Change the encapsulation on Router1 to PPP.
C. Change the bandwidth setting on Router1 to match the actual line speed
D. Verify successful DCE communication between the two sites.
E. Verify Layer1 communication on the Router1 Serial0/0 interface
Answer: B
Explanation
HDLC is a Cisco proprietary protocol so we can’t use it when connecting to a non-Cisco router. PPP is the standard protocol that is widely supported and used by many ISPs.
Question 7
From the choices shown above, which port can be used for a WAN T1 connection?
A. Console
B. Serial 0
C. AUI
D. BRI
E. None of the other alternatives apply
Answer: B
Explanation
The console port is intended for local administrative access from an ASCII terminal or a computer using a terminal emulator.
Serial ports support WAN T1 connection.
Attachment Unit Interface (AUI) ports are designed to connect to an external transceiver for conversion to a specific media type (such as twisted pair, coax, or fiber). AUI can transfer only 1 bit at a time.
BRI ports are used for ISDN services (mostly voice).
Question 8
A WAN connection is shown below:
Based on this diagram, which two devices can be used to complete the connection between the WAN router at the customer site and the service provider? (Choose two)
A. CSU/DSU
B. modem
C. WAN switch
D. ATM switch
E. Frame Relay switch
F. ISDN TA
Answer: A B
Explanation
A modem or CSU/DSU can provide clock rate so it can be used for the topology above.
The Channel Service Unit (CSU) can echo loopback signals from the phone company for testing purposes.
The Data Service Unit (DSU) manages line control, and converts input and output between RS-232C, RS-449, or V.35 frames from the LAN and the time-division multiplexed (TDM) DSX frames on the T-1 line. The DSU provides a modem-like interface between the computer as Data Terminal Equipment (DTE) and the CSU.
@aurion
it’s spam
@xallax : How significant are the WAN Questions? Similar to the actual test questions?
@aurion
these questions verify how well you know the WAN concepts. that’s what the actual test aims at too.
Hi how valid are these questions for the ICND1 Exam?
There is an error in question 6. It should be “Router1#show interface serial 0/0″ (Router 1 not router 2.)
hey guys, great site. was wondering if anyone knew if there was much/if any NAT config sims or questions on the ICND1 exam? im studying with Todd Lammle’s CCENT book and he didnt go too far into NAT but the ExamCram ebook i have goes into it in more detail. thanks
took icnd1 and 2 today. q8 was there on icnd1
passed with 962 and 986 respectively
Thank you all
passed ICND1 earlier with 874/1000. q 7 & 8 was there, and lots of ip addressing/subnetting.
hello! everyone from the site are the still on the questions on the net I’m prepare my ccnt_icnd1 just wanna fin out if still there the questions
any one can help me or direct me for the exam how many question are there ?
visit cisco.com
Nice questions.. I wonder if they’re still on the current exam. Planning to take the exam this week.
Can someone verify this questions?
Thanks
I am in disagreement with the answer to question 1. From my thinking WANs operate at layer 2 (think PPP, Frame Relay, HDLC) and layer 3 (think IP / routing). I don’t believe the answer is layer 1 and 2.
Question 6 isn’t quite right. They start telling us both routers are non-Cisco. Regardless of which router the output is for, both would need to be changed to ppp, as HCLD is always proprietary (no matter which vendor you’re dealing with). HDLC won’t talk to ppp, so both should be changed to ppp.
That should read HDLC, not HCLD.
can any body please send me the question i fell the test twice i’m not going to give up but i’m affraid to loose an other 125$ please help.
thanks
my email address is mandigo74@yahoo.com
Hi Team great site. pls tell me how many Qs in ICND1?what is the pass mark? I’m kinda new.Cheers
Hiy, guys i ran out of time yesterday due to that 5 question Router and Switch Console question anyone with the answers
After looking at Q6 again, answer B is correct. Since you have a Cisco router (R1) and a non-Cisco router (R2), and R1 is set for HDLC, changing R1 encapsulation to PPP would be the best answer (as most likely, the other side is set for PPP as well. The only other option for serial links on a Cisco router is Frame-relay, and since that wasn’t mentioned, you’d have to fall back to PPP as the best answer.
question about the ppp. what is it…
THe Whole q6 is flipped with errors, but you can still figure out that the only logical answer for the screwed up scenario is ppp.
Hi 9tut,
Cleared ICND1 this morning with an 874/1000 with 20 minutes to spare. Thought I did better but i’m not complaining, chuffed to clear it 1st time. It was easier than I anticipated, put the hours in studying and you will be fine. This was my first question on the exam. You have pretty much nailed it. show running-config on both devices and answer the 4 questions. The questions above are very close to what was asked. look for clear-text passwords, passwords on the console and vty lines, weak username and password command (cisco) , login local, the number of telnet sessions allowed, is a password configured for Telnet, exec-timeout, will it allow telnet and ssh etc.
I would like to thank 9tut / xallax and the everyone else for all the time you have put into this site. This site helped me pass as most of my questions were on the site!!! From what I remember, some of the questions I got were as follows:
-Security Testlet above, all the information is displayed in the running config, just go through the options given in the 4 questions
-Drag and Drop – DHCP (DORA) / Drag and Drop # 2 (file management – copy flash tftp etc) / DNS,ARP,DHCP (know what they do) / WAN technologies (Frame Relay – Packet switched , ATM – cell switched etc)
-Implementation SIM using show cdp neighbors command / show IP interface brief
-Show configuration SIM (show run / startup command disabled)
-Transport Layer fundamentals – 3 way handshake, TCP/UDP, Flow control
-Protocol process through the layers of TCP/IP stack sending an email using HTTP (SMTP at app layer – TCP at Transport layer – IP at Network layer – ARP at Network access layer)
-Encapsulation (HDLC) – default on Cisco devices
-Troubleshooting connectivity issues – when to use a X-over cable and Straight-through, spot incorrect cable in a diagram / duplex mismatch etc.
-Service Password Encryption and what it does
-What switches do when they get a packet with a destination MAC not in CAM table – Flood
-Indicator lights on a switch – Flashing green, Green etc (what each means – Full/Half duplex, network activity etc)
-Port-security, Mac-address sticky command, know what it does
-know the packet delivery process for the sending across the LAN and WAN (what MAC is used where etc) / ARP
-RIP (what happens when you enter router rip command – defaults to version 1)
-implementing a Static Route to default-gateway 0.0.0.0
-Subnetting,Subnetting,Subnetting (I had about 7 or 8 questions relating to Subnetting, valid host ranges, broadcast / network address etc. Practice and you will be fine. subnettingquestions.org I found really helpful. )
Hope this helps. Remember, do not memorize each question on this site, know the concepts and why they happen and you will be fine. I used CBTnuggets, Cisco Press Book, Packet tracer (I didn’t create any funky topologies, I just used it for working on the IOS entering commands) and subnettingquestions.org.
Onto ICND2 in the new year. Good luck!!!
Hi All, The above comment is copied from the Security Testlet tab. 1st paragraph relates to the Security testlet question.
Hey Mildred,
Been trying wrack my brain to gather some additional questions from my exam and came up with a few more to compliment the above article.
-Know the commands in user mode and the expected output once entered.
My question , command line displays:
———————–System Configuration Dialog—————————–
continue with configuration dialog? [yes/no]
What command was used to display the above output?
Answer: Router#setup
-Know how to retrieve information about a specific interface. I was asked what is the Bandwidth for the serial interface.
Answer: view diagram, use show interface serial #, retrieve the requested information
I got another question which required the use of the show interface command. In my question, the scenario was that host A wants to ping Host B via fa 0/0 interface but cannot, how will you resolve this issue, Use the show interface command to view the interface status / line protocol status. The interface was down so I believe the answer was to enter the “no shutdown” command on interface to change state to up.
Know the boot process for retrieving the startup-config , I believe the question was if the startup file cannot be found in ROM, where will the router look next?
-Looks in ROM, none found
-Looks in Flash, none found
-Looks in tftp server, none found
-Boots from ROMMON
Another question related to IP addressing. The question was what Class address is required if you need 66,000 hosts. I answered Class A as Class B will allow you 65,535 hosts.
Another question was to spot the private IP address in a list of 6 address.
The answer was 172.16.x.x
Again to re-iterate, subnetting is vital, know how to find the first / last host. Network and Broadcast address. Calculate the number of subnets and hosts from viewing an IP add/Subnet Mask. http://www.subnettingquestions.org is a great help. In addition to the questions on IP addresses above, I had possibly 2 or 3 questions where I had to identify valid hosts given an IP address and Subnet Mask.
Know the formula for calculating the number of subnets and hosts
# of Subnets = 2^x (where x equals the number of network bits borrowed)
# of Hosts-2^x-2 (where x equals the number of host bits in the subnet mask , or the number of 0′s in the SM)
Hope this helps, if I think of more, I will add more comments.
Also had some trouble with Q6. HDLC is Cisco-proprietary, yet is configured on R2, a non-Cisco router. Your “correct” answer is to configure PPP on R1, which would lead to incompatible protocols, thus continuing the up/down status. Clearly, I thought, both routers should be configured to operate on PPP, but that wasn’t an option.
Great site. A lot of useful information! Even if I don’t agree with some of the answers, I can at least come away with a better sense of what I need to target for my studies.
Thanks for the help!
Hi Michael,
Good spot. The text in the question indicates that the output displayed is for R1 but the command line output shows Router2#show interface serial 0/0
Ignoring the output error, the question tells you everything you need to know, the keywords are “two non-Cisco routers over a highly reliable WAN connection” and “A new Cisco router has been installed”
The concept is to understand that HDLC is Cisco proprietary and to resolve the issue, you should change the encapsulation to PPP as this is likely the encapsulation protocol used by a non-cisco router.
I had this question on my exam.
The main thing is to not memorise the answers but to understand the concepts.
I failed my exam 624/1000…..I need help IF you got any dumps or any study work please let me know
better luck next time
Guys be aware that the message on banner in this case is a threat!!!
I read that on CISCOPRESS and I’ve done the ICND1 Security testlet and got 100%.
And I ticked on unsecured message on banner twice…
When I saw people saying that the banner…
“it doesn’t mean a threat, even though, reading what i wrote before, concerning that book, the motd should be something like:” warning! you must be allowed in order to…”
I believe that they’re giving wrong answers to people, so I posted what is written on cisco press website (bellow) and the link for everybody to get more information about banners.
“When someone connects to one of your routers, he sees some sort of message or prompt. For legal reasons, Cisco suggests that a banner message be displayed to warn potential attackers not to attempt a login. For example, you wouldn’t want to use a banner message that says, “Welcome! You are connected to Router 1.” An attacker could use such a message as part of his legal defense, stating that he was told that he was welcomed to your router.”
I read that from the source below:
http://www.ciscopress.com/articles/article.asp?p=1221619&seqNum=2
I hope that helps
Rick
Cleared ICND1 today. Got questions 4 and 5. Thanks 9tut.
Irishdave,
I know it takes time to write out responses on the site and time is valuable, so thanks for taking the time. Your input is insightful, and extremely helpful! THANKS
I got question 1, 7 and 8 yesterday in my exam.
Got Q5 today on my Exam
