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- Question
Why does the data communication industry use the layered OSI reference model?
- It divides the network communication process into smaller and simpler components, thus aiding component development, design, and troubleshooting.
- It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.
- It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.
- It encourages industry standardization by defining what functions occur at each layer of the model.
Options- A. 1 only
- B. 1 and 4
- C. 2 and 3
- D. 3 only
- Correct Answer
- 1 and 4
ExplanationThe main advantage of a layered model is that it can allow application developers to change aspects of a program in just one layer of the layer model's specifications.Advantages of using the OSI layered model include, but are not limited to, the following:
It divides the network communication process into smaller and simpler components, thus aiding compo- nent development, design, and troubleshooting;
it allows multiple-vendor development through standardization of network components;
it encourages industry standardization by defining what functions occur at each layer of the model;
it allows various types of network hardware and software to communicate;
More questions
- 1. What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?
Options- A. Straight-through
- B. Crossover cable
- C. Crossover with a CSU/DSU
- D. Rolled Discuss
Correct Answer: Rolled
Explanation:
To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.- 2. Which protocol does Ping use?
Options- A. TCP
- B. ARP
- C. ICMP
- D. BootP Discuss
Correct Answer: ICMP
Explanation:
ICMP is the protocol at the Network layer that is used to send echo requests and replies.- 3. How should a router that is being used in a Frame Relay network be configured to keep split horizon issues from preventing routing updates?
Options- A. Configure a separate subinterface for each PVC with a unique DLCI and subnet assigned to the subinterface.
- B. Configure each Frame Relay circuit as a point-to-point line to support multicast and broadcast traffic.
- C. Configure many subinterfaces in the same subnet.
- D. Configure a single subinterface to establish multiple PVC connections to multiple remote router interfaces. Discuss
Correct Answer: Configure a separate subinterface for each PVC with a unique DLCI and subnet assigned to the subinterface.
Explanation:
If you have a serial port configured with multiple DLCIs connected to multiple remote sites, split horizon rules, stop route updates received on an interface from being sent out the same interface. By creating subinterfaces for each PVC, you can avoid the split horizon issues when using Frame Relay.- 4. Which of the following describe the process identifier that is used to run OSPF on a router?
- It is locally significant.
- It is globally significant.
- It is needed to identify a unique instance of an OSPF database.
- It is an optional parameter required only if multiple OSPF processes are running on the router.
Options- A. 1, 2 and 4
- B. 1 and 3
- C. 3 and 5
- D. All of the above Discuss
Correct Answer: 1 and 3
Explanation:
The Process ID for OSPF on a router is only locally significant and you can use the same number on each router, or each router can have a different number-it just doesn't matter. The numbers you can use are from 1 to 65,535. Don't get this confused with area numbers, which can be from 0 to 4.2 billion.- 5. Which two statements describe the IP address 10.16.3.65/23?
- The subnet address is 10.16.3.0 255.255.254.0.
- The lowest host address in the subnet is 10.16.2.1 255.255.254.0.
- The last valid host address in the subnet is 10.16.2.254 255.255.254.0.
- The broadcast address of the subnet is 10.16.3.255 255.255.254.0.
Options- A. 1 and 3
- B. 2 and 4
- C. 1, 2 and 4
- D. 2, 3 and 4 Discuss
Correct Answer: 2 and 4
Explanation:
The mask 255.255.254.0 (/23) used with a Class A address means that there are 15 subnet bits and 9 host bits. The block size in the third octet is 2 (256 - 254). So this makes the subnets in the interesting octet 0, 2, 4, 6, etc., all the way to 254. The host 10.16.3.65 is in the 2.0 subnet. The next subnet is 4.0, so the broadcast address for the 2.0 subnet is 3.255. The valid host addresses are 2.1 through 3.254.- 6. Which two of the following commands will place network 10.2.3.0/24 into area 0?
- router eigrp 10
- router ospf 10
- network 10.0.0.0
- network 10.2.3.0 0.0.0.255 area0
- network 10.2.3.0 0.0.0.255 area 0
Options- A. 1 and 4
- B. 2, 4, and 5
- C. 2 and 5
- D. 3 and 4 Discuss
Correct Answer: 2 and 5
Explanation:
To enable OSPF, you must first start OSPF using a Process ID. The number is irrelevant; just choose a number from 1 to 65,535 and you're good to go. After you start the OSPF process, you must configure any network that you want advertised via OSPF using wildcards and the area command. Statement (4) is wrong because there must be a space after the parameter area and before you list the area number.- 7. You have an interface on a router with the IP address of 192.168.192.10/29. Including the router interface, how many hosts can have IP addresses on the LAN attached to the router interface?
Options- A. 6
- B. 8
- C. 30
- D. 32 Discuss
Correct Answer: 6
Explanation:
A /29 (255.255.255.248), regardless of the class of address, has only 3 host bits. Six hosts is the maximum number of hosts on this LAN, including the router interface.- 8. Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.255.224?
Options- A. Router(config)#ip classless
- B. Router(config)#no ip classful
- C. Router(config)#ip unnumbered
- D. Router(config)#ip subnet-zero Discuss
Correct Answer: Router(config)#ip subnet-zero
Explanation:
A Class C subnet mask of 255.255.255.224 is 3 bits on and 5 bits off (11100000) and provides 8 subnets, each with 30 hosts. However, if the command ip subnet-zero is not used, then only 6 subnets would be available for use.- 9. You have a network with a subnet of 172.16.17.0/22. Which is the valid host address?
Options- A. 172.16.17.1 255.255.255.252
- B. 172.16.0.1 255.255.240.0
- C. 172.16.20.1 255.255.254.0
- D. 172.16.18.255 255.255.252.0 Discuss
Correct Answer: 172.16.18.255 255.255.252.0
Explanation:
A Class B network ID with a /22 mask is 255.255.252.0, with a block size of 4 in the third octet. The network address in the question is in subnet 172.16.16.0 with a broadcast address of 172.16.19.255. Only option E even has the correct subnet mask listed, and 172.16.18.255 is a valid host.- 10. Which command will copy the IOS to a backup host on your network?
Options- A. transfer IOS to 172.16.10.1
- B. copy run start
- C. copy start tftp
- D. copy flash tftp Discuss
Correct Answer: copy flash tftp
Explanation:
To copy the IOS to a backup host, which is stored in flash memory by default, use the copy flash tftp command.
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