CCNA – Troubleshooting 1
Here you will find answers to Trouble Shooting Questions (Part 1)
Question 1:
Refer to the exhibit. The network administrator is in a campus building distant from Building B. WANRouter is hosting a newly installed WAN link on interface S0/0. The new link is not functioning and the administrator needs to determine if the correct cable has been attached to the S0/0 interface. How can the administrator accurately verify the correct cable type on S0/0 in the most efficient manner?
A. Telnet to WANRouter and execute the command show interfaces S0/0
B. Telnet to WANRouter and execute the command show processes S0/0
C. Telnet to WANRouter and execute the command show running-configuration
D. Telnet to WANRouter and execute the command show controller S0/0
E. Physically examine the cable between WANRouter S0/0 and the DCE.
F. Establish a console session on WANRouter and execute the command show interfaces S0/0
Answer: D
Explanation:
The show controller command displays the information about the physical interface itself and the type of serial cable plugged into a serial port. In this case, it should be a DTE cable that plugs into a type of data service unit (DSU).
For your understanding, below is the output of this command:
From the output, we notice that serial 0/0 has a DTE cable and would get its clocking from the DSU.
Question 2:
Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity?
A. A loopback is not set
B. The IP address is incorrect.
C. The subnet mask is incorrect.
D. The serial line encapsulations are incompatible.
E. The maximum transmission unit (MTU) size is too large.
F. The bandwidth setting is incompatible with the connected interface.
Answer: B
Question 3:
Refer to the exhibit. The two exhibited devices are the only Cisco devices on the network. The serial network between the two devices has a mask of 255.255.255.252. Given the output that is shown, what three statements are true of these devices? (Choose three)
A. The Manchester serial address is 10.1.1.1.
B. The Manchester serial address is 10.1.1.2.
C. The London router is a Cisco 2610.
D. The Manchester router is a Cisco 2610.
E. The CDP information was received on port Serial0/0 of the Manchester router.
F. The CDP information was sent by port Serial0/0 of the London router.
Answer: A C E
Explanation:
From the output, we learn that the IP address of the neighbor router is 10.1.1.2 and the question stated that the subnet mask of the network between two router is 255.255.255.252. Therefore there are only 2 available hosts in this network (22 – 2 = 2). So we can deduce the ip address (of the serial interface) of Manchester router is 10.1.1.1 -> A is correct
The flatform of the neighbor router is cisco 2610, as shown in the output -> C is correct
Maybe the most difficult choice of this question is the answer E or F. Please notice that “Interface” refers to the local port on the local router, in this case it is the port of Manchester router, and “Port ID (outgoing port)” refers to the port on the neighbor router -> E is correct.
Question 4:
A network administrator has configured two switches, named London and Madrid, to use VTP. However, the switches are not sharing VTP messages. Given the command output shown in the graphic, why are these switches not sharing VTP messages?
A. The VTP version is not correctly configured.
B. The VTP operating mode is not correctly configured.
C. The VTP domain name is not correctly configured.
D. VTP pruning mode is disabled.
E. VTP V2 mode is disabled.
F. VTP traps generation is disabled.
Answer: C
Explanation
In the exhibit, the Domain Names of 2 switches are mismatched (one is “London” and the other is “Madrid”) so these switches do not share VTP messages -> The VTP domain name is not correctly configured. Notice that the Domain Names should be the same on both switches to share VTP messages.
Question 5:
The network shown in the diagram is experiencing connectivity problems. Which of the following will correct the problems? (Choose two.)
A. Configure the gateway on Host A as 10.1.1.1.
B. Configure the gateway on Host B as 10.1.2.254.
C. Configure the IP address of Host A as 10.1.2.2.
D. Configure the IP address of Host B as 10.1.2.2.
E. Configure the masks on both hosts to be 255.255.255.224.
F. Configure the masks on both hosts to be 255.255.255.240.
Answer: B D
Question 6:
Refer to the exhibit:
The network administrator has created a new VLAN on Switch1 and added host C and host D. The administrator has properly configured switch interfaces FastEthernet0/13 through FastEthernet0/24 to be members of the new VLAN. However, after the network administrator completed the configuration, host A could communicate with host B, but host A could not communicate with host C or host D. Which commands are required to resolve this problem?
A. Router(config)# interface fastethernet 0/1.3
Router(config-if)# encapsulation dot1q 3
Router(config-if)# ip address 192.168.3.1 255.255.255.0
B. Router(config)# router rip
Router(config-router)# network 192.168.1.0
Router(config-router)# network 192.168.2.0
Router(config-router)# network 192.168.3.0
C. Switch1# vlan database
Switch1(vlan)# vtp v2-mode
Switch1(vlan)# vtp domain cisco
Switch1(vlan)# vtp server
D. Switch1(config)# interface fastethernet 0/1
Switch1(config-if)# switchport mode trunk
Switch1(config-if)# switchport trunk encapsulation isl
Answers: A
Question 7:
Refer to the exhibit. Hosts on the same VLAN can communicate with each other but are unable to communicate with hosts on different VLANs. What is needed to allow communication between VLANs?
A. a switch with a trunk link that is configured between the switches
B. a router with an IP address on the physical interface that is connected to the switch
C. a switch with an access link that is configured between the switches
D. a router with subinterfaces configured on the physical interface that is connected to the switch
Answer: D
Question 8:
The show interfaces serial 0/0 command resulted in the output shown in the graphic. What are possible causes for this interface status? (Choose three)
A. The interface is shut down.
B. No keepalive messages are received.
C. The clockrate is not set.
D. No loopback address is set.
E. No cable is attached to the interface.
F. There is a mismatch in the encapsulation type.
Answer: B C F
Question 9:
While troubleshooting a connectivity issue from a PC you obtain the following information:
Local PC IP address: 10.0.0.35/24
Default Gateway: 10.0.0.1
Remote Sever: 10.5.75.250/24
You then conduct the following tests from the local PC:
Ping 127.0.0.1 – Successful
Ping 10.0.0.35 – Successful
Ping 10.0.0.1 – Unsuccessful
Ping 10.5.75.250 – Unsuccessful
What is the underlying cause of this problem?
A. A remote physical layer problem exists.
B. The host NIC is not functioning.
C. TCP/IP has not been correctly installed on the host.
D. A local physical layer problem exists.
Answer: D
@levy
when an associate trouble shoots network problem ,the procedure he follows is step by step.
frst check the local nic and tcp /ip stack ,then local network and then remte network connectivity.
when he finds the local network itself to be (local physical network) down how can he deduce it to be a remote L1 problem??for him to check the remote connectivity, frst of all local physical network shud be operational , then only the packets can traverse across a remote network for trouble shooting.
hi …for Q4 VTP operation mode define as a server in both the cases…so correct ans is B and C both…can anyone tell me i am correct or not
@ rakesh shah
operating mode is correctly configured,
if both switches are server, then also they will share same vlan database based on vtp messages if domain name on both switches are correctly configured.
so option b is wrong..
@anup
I thought the local means just the computer interfaces….
now I think the local problem means that problem can be with the router too….
it was why i didnt understand…
The “local” means that particular LAN segment!
Thanks 9tut!=D
Hi Everyone.Im doing a self study 4 ccna and Im taking the exam by lask week of this month.
Can any good hearted and helping person send me latest dumps for 640-802 to priya.ccna@yahoomail.in. Tanx in Advance.
@Xallax @9tut
Re posting 25 Nov
Answer is sh mac address or sh mac-address (depending on the switch IOS)
Sh arp is not correct
Refer posting CCNA-switches 3 from Tester Aptil 7 on a 3560
Refer my testing on my own 2950-48 switch below
AUWAGSW1#sh mac ?
access-group MAC access-group
address-table MAC forwarding table
AUWAGSW1#sh mac address-table
Mac Address Table
——————————————-
Vlan Mac Address Type Ports
—- ———– ——– —–
All 0009.e8e9.3940 STATIC CPU
All 0100.0ccc.cccc STATIC CPU
All 0100.0ccc.cccd STATIC CPU
All 0100.0cdd.dddd STATIC CPU
1 0009.e8ea.0981 DYNAMIC Fa0/1
1 0009.e8ea.0c83 DYNAMIC Fa0/3
1 0009.e8ea.0cb1 DYNAMIC Gi0/1
1 000c.3104.2003 DYNAMIC Fa0/6
1 0010.a47c.1b14 DYNAMIC Fa0/45
Total Mac Addresses for this criterion: 9
AUWAGSW1#sh arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.10.10.50 0 0010.a47c.1b14 ARPA Vlan1
Internet 10.10.10.240 – 0009.e8e9.3940 ARPA Vlan1
As per above sh mac address on my WS-C2950-48 switch list mac to switch port. sh arp associates ip to mac
Regard to Question 8 the no receive keep alive messages is a result of a layer two connection problem. It is not the cause that create layer 2 connection problems.
Even though if I disable the keepalive (using the command no keepalive) , there would still be connection
any ideas?
Hi all, I am taking CCNA 640-802 exam first time on 30/05/2012. Could anyone please send me latest dumps which are valid for UK? My e-mail address is puneet_gill84@yahoo.co.uk. Many thanks.
I PASSED CCNA EXAM TODAY THANKS TO ALL MIGHTY ALLAH
960/1000
Hi there i’m planning to take CCNA by the end of the month (still almost 14 days) im looking for the types of questions and some labs please help !
youred1988@hotmail.com
Q9 Since the host cannot get past the int on the switch and it can only ping it’s self you move up the OSI layer to solve the problem. Since layer 1 is phyical and with the question selection that narrows the problem down to “local phyical layer problem”
A Is possible but from your POV at the time its not probable and its wrong cause you skiped several layers of the OSI to get there. “Answer A is right for the wrong reasons”
Reason being you could have saved your self the hike to the Sever room or switch closet in your location if you’d had checked your end. And make sure all your “i’s” dotted and “t’s” are crossed before “doing the human thing and blaming every one but your self”
B, C is wrong cause you can ping your self
Remember when TS the network always use the chain of command
1. Physical
2. Data-link
3. Network … etc
I passed my ccna exam today Praise be to God! Thank you Jesus! and thanks to 9TUT for the tutorials and explanations, great site and thanks to xallax for your explanations to questions and thanks to http://www.examcollection.com for the dumps. Pls guys lets donate and help to keep this site up!
48 ques for exams including 3 simulation, I had EIGRP, Acesslist2 and VTP. Make sure the practice the simulation, use packet tracer or gns3. Best wishes to all!
I’m planing on writing the CCNA at the end of July or begining of August 2012.
Some people recommend Jericho, Collisio etc. 9tut.com
What would be the most current and up to date dumps for me to read and practice on?
Thank you very much
anup.18@hotmail.com
Q2. why not D?
The bandwidth setting is incompatible with the connected interface.
in what Layer is BW?
in what Layer is IP?
Which command will show the MAC addresses of stations connected to switch ports?
A. show mac-address
B. show arp
C. show table
D. show switchport
DimS answers A
wich command will show the mac address connecteds to switch ports:
*show mac-address
*show arp
*show table
*show switchport
xallax answers B
Can you please explain the difference of the two questions or 2 commands. Im not memorizing the answers or the questions.
Please explain the show arp and show mac-address-table
MAC addresses of stations connected to switch ports = what do you mean by stations?
Thanks. Thanks.
@ almira
if you read it carefully you will get to knw that both the question are ain’t d same in first question he is asking abt the “mac address of the stations ” means end devices matched with the port Number, but in second it is not about stations, he is asking mac add only, Not The Mac address is matched with the port Number but r Layer 3 Logical Addresses to Layer 2 Physical Address which entry you find in arp cache.
Q.9
Answer for Local physical link can not be right because the ping to that address is success.
Ans. A Remote physica
@viewer
No, the successful ping to the loopback (layer 3) and the PC’s NIC (layer 2) shows the PC is working properly. But ping from PC to the default gateway fails. It show there’s layer 1 problem somewhere on the cable between the router and the PC. It’s definitely local side problem.
@almira
Which command will show the MAC addresses of stations connected to switch ports?
A. show mac-address
B. show arp
C. show table
D. show switchport
We still do not have a definitive answer: Regardless that show mac-address is incomplete, type it in a switch prompt and see what you get. I think its a very poor quality question but would like to hear from anyone that actually got it on a test recently.
Question 10
Which command will show the MAC addresses of stations connected to switch ports?
A. show mac-address
B. show arp
C. show table
D. show switchport
Answer: B
Explanation
There is no “show mac-address” command. But notice the “show mac-address-table” and “show mac address-table” do exist.
If option A is “show mac-address-table” then both A & B are correct!
…… you can type show mac-address ,cr
BTW nice job 9tut
I have a question what is the block size for /16(255.255.0.0) and /24(255.255.255.0)
I know it should be simple. Is it 255 for /24? or is it 256-255=1?(for /24) If that is true then what would be the broadcast address if the block size is only 1? There would be no network address or broadcast address.
Oh never mind I looked it up with a subnetting calculator. 24 =block size of 254=(which equals hosts ) and 0.255 being the broadcast address and only 1 subnet in the whole fourth octet.
Re ques 9 ans is D. A local physical layer problem exists.
The successful ping was to 10.0.0.35 (some other random address to mislead you) but was unsuccessful to 10.0.0.1 (its gateway).
So the problem is still somewhere between the router and the host (confirmed by the inability to ping the fa1/1 int on the router) and could be fairly called local in the context of the question. While the connection between the router and the server can be fairly called remote.
Q9 : Maybe the Fa1/1 interface of the router is down.
It could also be a remote physical layer problem.
question what is the advantage of using multi point than using point subinterfaces in frame relay this was in my exam at 12 aug 12
@Xallax
Which two Cisco IOS command used in troubleshooting can enable debug output to a remote location ?
A. no logging console
B. terminal monitor
C. logging host ip-address
D. snmp-server enable traps syslog
E. show loggin | redirect flash: out.txt
for this question is the correct answer is BE OR BC
@Xallax
Which Cisco IOS command can help to determine the timing of various debug events, relative to each other, when you are debugging a complicated router issue?
A-service timestamps log datetime msec
B-clock calendar-valid
C-show clock detail
D-service timestamps debug datetime msec
for this question is the correct answer is A OR D
@smart86
q1:
you have to see the output shown on the console (“terminal monitor”)
i’d pick option C as it saves the log to a remote location while option E just tells you the logging settings
q2:
it says “debug” so pick the one with debugging. correct answer is D
http://www.cisco.com/en/US/docs/ios/12_3/configfun/command/reference/cfr_1g07.html
Hello guys, Iam currently studying for my ccna using chris bryant ccent 1 videos,they are quite awesome the problem is i dont have ccent 2 videos,if you have cant you email them to me?rebamodimooagile@mascom.bw
Can you please explain me q5. thx
Question 9
If EVERYTHING local checks out ok, how can this still be a local problem? What else is there to check locally? I still gravitate to (a) as the answer.
@AA
iT’s Simple….
Check The Router Subinterfaces…. Each SubInterface Belongs To a VLAN “”Network””
Vlan1
10.1.1.254
Vlan2
10.1.2.254
So Router iN Vlan2 iS Configured Wrong ..
His IP Address Should b iN The Vlan2 “”Network 10.1.2.x”
And His Gateway Should b The SubInterface oF Vlan2 Which iS “10.1.2.254″
Focus….
@Dwit
iT Should b a Cable Problem.
Troubleshooting iS Like An Access-List, iT Stops At First MATCH…
u rn’t Sure That The Pc Has A Connectivity With The Switch ;)
Dont Look Far…
q5 not clear any help guys
@Vola
Question 5
The IPs oF The SubInterfaces oF The Routers
10.1.*1*.254/24 Vlan1
10.1.*2*.254/24 Vlan2
Host B iS iN Vlan2 .. But Have IP Address oF Vlan1 And Gateway oF Vlan1
pliz send ccna questions with answers .also latest dumps i will for ccna cert in dec 2012
Beside labs about vtp, acl, and eigrp, are there other labs in the ccna exam?
thanks a lot folks
hi cays i am iraj i have done ccna exam 08 – 12 -12
all the bast my cays
i am from srilanka my age 19
irajvino@live.com
;D
TY 9tut.
Today I have passed the CCNA. (860/825)
50 questions 3 labs (VTP, EIGRP, ACL). 35 from 9tut.
Also thanks a lot Brar and Sekhar (still valid from examcollection)
Ty again 9tut
from here none
Q6 today
Hi
if any one have ccna 640-802 dumps so pl send at najamptcl@yahoo.com. i am going to appear in test soon.
thanks in advance
Hey guys,
Question about Question 1.
I’m still lacking in the cable stuff.
What kind of cable should be connected from DSU/CSU device? Show controllers command shows its a V35 DTE cable. What cable should it be?
I’m trying to grasp serial connections.
THANKS!
A CSU/DSU should have the DCE end of a serial cable connected to it.
guys can you please send me PDF dumps of sakhar, my email is renojefa@gmail.com thanks
Kindly send me latest dumps and labs in my email mario_azucena@yahoo.com. Thanks a lot!
Hi!!!
Can you please send me latest dumps and labs in my email batyr.mukushev@gmail.com.
THX!!
I do not believe the answer to Q9 is correct. How could the host have a local physical layer problem if it can ping its sefault gateway?
Misiela, the host can not ping its default gateway, it just pings itself
Hello,
Can anyone, please, tell me if I understand correctly the answer to question 9?
If host can ping itself (not only loopback IP), it means that the L1 between Switch e Host is ok. So the problem, is the L1 between Sw2 and Router.
First I choose answer A).However after I see the answer D), I suppose that when refer to local physical layer we are saying bettween Router and host, am I right?
Thanks,