CCNA – Basic Questions 2
Here you will find answers to Basic Questions – Part 2
Question 1
What are some of the advantages of using a router to segment the network? (Choose two)
A. Filtering can occur based on Layer 3 information.
B. Broadcasts are eliminated.
C. Routers generally cost less than switches.
D. Broadcasts are not forwarded across the router.
E. Adding a router to the network decreases latency.
Answer: A D
Question 2
Which of the following statements describe the network shown in the graphic? (Choose two)
A. There are two broadcast domains in the network.
B. There are four broadcast domains in the network.
C. There are six broadcast domains in the network.
D. There are four collision domains in the network.
E. There are five collision domains in the network.
F. There are seven collision domains in the network.
Answer: A F
Explanation
Only router can break up broadcast domains so in the exhibit there are 2 broadcast domains: from e0 interface to the left is a broadcast domain and from e1 interface to the right is another broadcast domain -> A is correct.
Both router and switch can break up collision domains so there is only 1 collision domain on the left of the router (because hub doesn’t break up collision domain) and there are 6 collision domains on the right of the router (1 collision domain from e1 interface to the switch + 5 collision domains for 5 PCs in Production) -> F is correct.
Question 3
Refer to the exhibit. The two connected ports on the switch are not turning orange or green. What would be the most effective steps to troubleshoot this physical layer problem? (Choose three)
A. Ensure that the Ethernet encapsulations match on the interconnected router and switch ports.
B. Ensure that cables A and B are straight-through cables.
C. Ensure cable A is plugged into a trunk port.
D. Ensure the switch has power.
E. Reboot all of the devices.
F. Reseat all cables.
Answer: B D F
Explanation
The ports on the switch are not up indicating it is a layer 1 (physical) problem so we should check cable type, power and how they are plugged in.
Question 4
For what two purposes does the Ethernet protocol use physical addresses? (Choose two)
A. to uniquely identify devices at Layer 2
B. to allow communication with devices on a different network
C. to differentiate a Layer 2 frame from a Layer 3 packet
D. to establish a priority system to determine which device gets to transmit first
E. to allow communication between different devices on the same network
F. to allow detection of a remote device when its physical address is unknown
Answer: A E
Explanation
Physical addresses or MAC addresses are used to identify devices at layer 2 -> A is correct.
MAC addresses are only used to communicate on the same network. To communicate on different network we have to use Layer 3 addresses (IP addresses) -> B is not correct; E is correct.
Layer 2 frame and Layer 3 packet can be recognized via headers. Layer 3 packet also contains physical address -> C is not correct.
On Ethernet, each frame has the same priority to transmit by default -> D is not correct.
All devices need a physical address to identify itself. If not, they can not communicate -> F is not correct.
Question 5
Refer to the exhibit. Two buildings on the San Jose campus of a small company must be connected to use Ethernet with a bandwidth of at least 100 Mbps. The company is concerned about possible problems from voltage potential difference between the two buildings. Which media type should be used for the connection?
A. UTP cable
B. STP cable
C. Coaxial cable
D. Fiber optic cable
Answer: D
Explanation
Because the company has problem about voltage potential difference between the two buildings so they should connect via fiber optic cable which uses light pulses to transmit information instead of using electronic pulses.
Question 6
Which command can be used from a PC to verify the connectivity between host that connect through path?
A. tracert address
B. ping address
C. arp address
D. traceroute address
Answer: A
Explanation
To check the connectivity between a host and a destination (through some networks) we can use both “tracert” and “ping” commands. But the difference between these 2 commands is the “tracert” command can display a list of near-side router interfaces in the path between the source and the destination. Therefore the best answer in this case is A – tracert address.
Note: “traceroute” command has the same function of the “tracert” command but it is used on Cisco routers only, not on a PC.
Question 7
Refer to the exhibit. A network engineer is troubleshooting an internet connectivity problem on the computer. What causing the problem?
A. wrong DNS server
B. wrong default gateway
C. incorrect IP address
D. incorrect subnet mask
Answer: C
Explanation
The IP address of the PC (192.168.11.2/24) is not on the same network with its gateway 192.168.1.1 -> C is correct.
Question 8
How many broadcast domains are shown in the graphic assuming only the default vlan is configured on the switches?
A. one
B. six
C. twelve
D. two
Answer: A
Explanation
Only router can break up broadcast domains but in this exhibit no router is used so there is only 1 broadcast domain.
For your information, there are 7 collision domains in this exhibit (6 collision domains between hubs & switches + 1 collision between the two switches).
Question 9
Refer to the exhibit.
|
PC> tracert 10.16.176.23 1 31 ms 31 ms 32ms 172.16.182.1 Trace complete. |
Host A has tested connectivity to a remote network. What is the default gateway for host A?
A. 172.16.182.1
B. 192.168.1.1
C. 10.16.176.1
D. 192.168.1.6
Answer: A
Explanation
It will list all the routers (from nearest to farthest) it passes through until it reaches its destination so the first hop is its nearest IP. If we ping from a PC, it is also the default gateway for that PC -> A is correct.
Question 10
What functions do routers perform in a network? (Choose two)
A. packet switching
B. access layer security
C. path selection
D. VLAN membership assignment
E. bridging between LAN segments
F. microsegmentation of broadcast domains
Answer: A C
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A host is attempting to send data to another host on a different network. What is the first action that the sendin host will take?
A.Send the data frames to default gateway.
B.Create an ARP request to get a MAC address for the receiving host.
Which is the best ans ???
..
No disrespect to xallax for his answer of A but the actual answeris B. This is a “trick” question that appears in one form or another on almost every ccna level exam. The very first thing that a host does when he wants to communicate with another host, is send an arp packet requesting the MAC address of the destination IP. The default gateway will reply to the arp with its own MAC address.
BUT, and this is the “trick” part of the question, the host creates an entry in his arp cache table that lists the MAC address of the destination host IP address as being that of the default gateway. Of course, it isn’t but for the hosts perspective it IS. Just try it out and display the arp cache table.
The key is that the VERY FIRST thing the host does is create an arp request to obtain the MAC address of the receiving host. The host does not just begin sending frames to the default gateway without sending an arp. If you display the arp cache on the host before it sends any packets to an IP address off of the local LAN, you will see that there is no entry for the default gateway.
Remember, you configure the IP address of the default gateway and not the MAC, so the host does not know the MAC address of the gateway. After obtaining the gateway MAC it is not kept indefinitely because it could change. There are different defaults depending on OS but I believe the default in windows is two minutes — could be wrong cuz I haven’t checked it in quite a while.
Try this while running a trace with wireshark — it’s the best way to see what really happens “under the covers.”. :-)
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i gave you my reasons why i’d go for A. ill try it again :)
i agree with you that the very first thing the host does when it gets connected the very first time on that network is to get the MAC of the default gateway.
the option provided isnt “get the MAC of the default gateway”, it is “get the MAC of the receiving host”.
they are on different networks, the sender will have no interest at all to know the MAC of the destination.
my answer is still A.
Option B is “CREATE an arp request to get the MAC address of the receiving host.” and that is exactly what the host does. It creates an arp request with the dest IP of the receiving host — not the MAC of the default gateway. It does of course, get the MAC of the default gateway back via proxy arp response.
Sorry…I meant not the IP of the default gateway. :-)
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My 2 cents on the question:
A host is attempting to send data to another host on a different network. What is the first action that the sendin host will take?
A.Send the data frames to default gateway.
B.Create an ARP request to get a MAC address for the receiving host.
My guess A
[It is easy for a host to see if the IP belongs to the same subnet or not … since it belongs to another subet – it will blindly pass it on to the router and be done with it.
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the ttl value is decreased by 1 aftr every route
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Host a 2 router = 254
Router3= 253
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