CCNA – Protocols & Services
Here you will find answers to CCNA – Protocols & Services Questions
Question 1
An administrator attempts a traceroute but receives a “Destination Unreachable” message. Which protocol is responsible for that message?
A. RARP
B. RUDP
C. ICMP
D. SNMP
Answer: C
Explanation
The ICMP destination unreachable message is generated by a router (which is reachable) to inform the source host that the destination unicast address is unreachable.
Question 2
DNS servers provide what service?
A. They run a spell check on host names to ensure accurate routing
B. They convert domain names into IP address
C. Given an IP address.they determine the name of the host that is sought
D. They map individual hosts to their specific IP addresses
Answer: B
Explanation
For example, when you open a web browser (IE, Firefox…) and type a domain (like google.com). This domain will be sent to a DNS server. The DNS server looks up this domain in its database and sends back a corresponding IP address which you can use to access that website.
Note: A DNS server can be a dedicated device for DNS service or integrated into a networking device (like router).
Question 3
Which of the following protocols uses both TCP and UDP ports?
A. SMTP
B. Telnet
C. FTP
D. DNS
Answer: D
Explanation
DNS can use either the User Datagram Protocol (UDP) or Transmission Control Protocol (TCP) with a destination port of 53.
Note:
+Simple Mail Transfer Protocol (SMTP) is specified for mail transport and uses TCP port 25.
+ Telnet uses TCP on port 23.
+ File Transfer Protocol (FTP) uses TCP on port 20, 21.
+ Trivial File Transfer Protocol (TFTP) uses UDP on port 69.
+ HTTP Secure (HTTPS) uses TCP on port 443.
Question 4
Which protocol should be used to establish a secure terminal connection to a remote network device?
A. ARP
B. SSH
C. Telnet
D. WEP
E. SNMPv1
F. SNMPv2
Answer: B
Explanation
Secure Shell (SSH) protocols secure terminal session data across insecure environments such as the internet.
Question 5
A network administrator issues the ping 192.168.2.5 command and successfully tests connectivity to a host that has been newly connected to the network. Which protocols were used during the test? (Choose two)
A. ARP
B. CDP
C. DHCP
D. DNS
E. ICMP
Answer: A E
Explanation
In this question we are not sure the host 192.168.2.5 is in or outside the local network. But in both cases the ARP protocol are used to get the MAC address:
+ If host 192.168.2.5 is inside the local network, our device will broadcast an ARP Request to ask the MAC address of the host 192.168.2.5 (something like “If your IP is 192.168.2.5, please send me your MAC address”).
+ If host 192.168.2.5 is outside the local network, our device will broadcast an ARP Request to ask the MAC address of the local port (the port in the same subnet with our device) of the default gateway. Notice that the IP of the default gateway has been already configured in our device.
-> In both cases, our device must broadcast an ARP Request -> A is correct.
After getting the ARP of the destination device, our device will use ICMP protocol to send the “ping” -> E is correct.
Note: The question states “the host has been newly connected to the network” which means our device hasn’t had the MAC address of this host in its ARP table -> it needs to send ARP Request.
There is one situation which makes answer A incorrect: the newly connected host is outside the network but our device has already learned the MAC address of the default gateway -> in this case no ARP Request will be sent. So I assume the question wants to imply the newly connected host is in the local network.
Question 6
Which network protocol does DNS use?
A. FTP
B. TFTP
C. TCP
D. UDP
E. SCP
Answer: D
Explanation
It is funny that in Question 3 I answered “DNS uses both TCP & UDP” but in this question we can only choose one answer and it should be “DNS uses UDP”. So I wish to explain more:
Normally a client sends a DNS Query using UDP Protocol over Port 53. If it does not get response from a DNS Server, it must re-transmit the DNS Query using TCP after 3-5 seconds. So we can say DNS prefers using UDP to TCP -> the answer should be UDP.
Question 7
When two hosts are trying to communicate across a network, how does the host originating the communication determine the hardware address of the host that it wants to “talk” to?
A. RARP request
B. Show Network Address request
C. Proxy ARP request
D. ARP request
E. Show Hardware Address request
Answer: D
Explanation
The address resolution protocol (ARP) is a protocol used to map IP network addresses to the hardware addresses.
+ If the destination host is inside the local network, the originating host will broadcast an ARP Request to ask the MAC address of that host.
+ If the destination host is outside the local network, the originating host will broadcast an ARP Request to ask the MAC address of the local port (the port in the same subnet with our device) of the default gateway. Notice that the IP of the default gateway has been already configured in our device.
Question 8
Refer to the exhibit, Host A pings interface S0/0 on router 3, what is the TTL value for that ping?
A. 253
B. 252
C. 255
D. 254
Answer: A
Explanation
From the CCNA ICND2 Exam book: “Routers decrement the TTL by 1 every time they forward a packet; if a router decrements the TTL to 0, it throws away the packet. This prevents packets from rotating forever.” I want to make it clear that before the router forwards a packet, the TTL is still remain the same. For example in the topology above, pings to S0/1 and S0/0 of Router 2 have the same TTL.
The picture below shows TTL values for each interface of each router and for Host B. Notice that Host A initializes ICMP packet with a TTL of 255:
Muy Básico, excelente =)
Q:6
LOL
Q6 thanks for the answer…i knew it used both port but did not know how the process took place.
@9tut
Q5′s explanation
After getting the ARP of the destination device… [C is correct].
should be [E is correct]
thank you
@xallax: Yes, thank for your detection. I updated it.
@9tut
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Dear Team,can u send me the latest dumps bcoz i have to take exam this month my mail id : lekhraj23desale@gmail.com
Q3 was there n today’s exam.
@canand: How was your exam? Please give some ideas about the ques.
@9tut: @Xallax: Regarding Q7. to send the frame outside the network, it always send the ARP Broadcast. It will never directly send the Data in broadcast.?? correct ??
because, in some dump it will said that data will be broadcast instead of ARP
@arpit
sending OUTSIDE the network involves Layer 3 (Network). IP addresses.
there might be one ARP at the very first state if the sender doesnt know the MAC of the default gateway.
the rest is just a succession of forwarded frames from the sender to the default gateway, from the default gateway all the way to the receiver’s default gateway, from the receiver’s default gateway to the receiver.
this goes back and forth.
the ARP frame doesnt contain much data, it just asks for the MAC of a device that has the IP x.x.x.x
Taking the exam soon. Can you send the latest dumps (anyone)? tljames12@yahoo.com. Thanks
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Q6 well done
Q6 Gooood……..
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hi,
can anyone send me the latest dumps? I’ll take my CCNA exam next friday…
thanks,
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Q6 was in my exam
If Q6 was in the exam worded like that, I would complain and write a note. It would need to be worded something like – “When a client initiate a DNS Query to a DNS Server, what protocol is first used?” for the single answer of UDP to be valid.
Don’t take any crap.
Q5 has a good explanation but is not quite the full story. An ARP message may not be sent from the originating host when the receiving host is on a different network. Whilst the originating host will need to get to its default gateway, chances are that that request has already happened and so the ARP cache for the originator has already been built.
However, as the receiver has been newly added to a network segment, when the ICMP packet gets to the the final layer 3 device (router) which shares the receivers subnet, the router WILL need to send and ARP message for the destination host MAC, before forwarding on the ICMP packet.
In any case, ARP is still used, albeit a but further down the line.
q6
if i get the question on my test what do i need to the select as a valid answer :0(
After reading my Cisco Academy press books from college I flying through this questions without looking at the answers BEAST!!!! Make sure you guy’s know your material good luck.
One thing new i got in Q: 6
Thanks for explaining. realy love it
hi,
Question 6
Which network protocol does DNS use?
A. FTP
B. TFTP
C. TCP
D. UDP
E. SCP
Answer: D
Doesn’t DNS also use TCP?
Please, explain.
I am going to take the exam by next week.
@wanto pass
here is an explaination from xallax
DNS uses both UDP and TCP
as per wikipedia:
“DNS primarily uses User Datagram Protocol (UDP) on port number 53 to serve requests. DNS queries consist of a single UDP request from the client followed by a single UDP reply from the server. The Transmission Control Protocol (TCP) is used when the response data size exceeds 512 bytes, or for tasks such as zone transfers. Some resolver implementations use TCP for all queries.”
correct answers here would be A and D
thanx xallax
Thank to Jehovah !
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@Cezar, Congrats!! ;)
Q7 explanation: If the Default gateway is already set on the host and if the network is not on the same subnet (the host knows it); why would it send a broadcast (ARP) to know the MAC address then? The host already know it (Default gateway) see?
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ls friend am still interestedin the latest dums,my exam is next week. Cezar congrats,still don’t understand your exlanation,can you pls send it to my box:bola_unad@yahoo.co uk.tnx all
Q6 – UDP for name resolution is fine – but you really want TCP when you are doing a zone transfer for obvious reasons. It gives you a nice warm and fuzzy feeling knowing that your packets arrived.
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Thanks. most gracious.
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Thanks
Are the above questions on the test?
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Failed the exam last Wednesday, got 805 and was pissed off coming out of the centre. I messed up the ACL by first off putting in the wrong address for the finance server, but removed the ACL and did 102 but then only blocked host 3 instead of ‘IP any’. Completely killed it.
The print out gave me 25% for the ACL, while the other sections were around 70% with the highest being 85%. Can someone tell me if 85% is as high as you can get? I got all the VTP sim right and still got 85%, was thinking maybe an issue with me using ‘copy run start’ instead of the whole command.
Back in tomorrow and going to nail it!!
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me kagon dios
just remember that switches do their processing in hardware, while routers in software, therefore they have no limitations as far as ASIC goes
I PASSED CCNA EXAM TODAY THANKS TO ALL MIGHTY ALLAH
960/1000
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