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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 are the two main types of access control lists (ACLs)?
- Standard
- IEEE
- Extended
- Specialized
Options- A. 1 and 3
- B. 2 and 4
- C. 3 and 4
- D. 1 and 2 Discuss
Correct Answer: 1 and 3
Explanation:
Standard and extended access control lists (ACLs) are used to configure security on a router.- 2. What does the command o/r 0x2142 provide?
Options- A. It is used to restart the router.
- B. It is used to bypass the configuration in NVRAM.
- C. It is used to enter ROM Monitor mode.
- D. It is used to view the lost password. Discuss
Correct Answer: It is used to bypass the configuration in NVRAM.
Explanation:
The default configuration setting is 0x2102, which tells the router to load the IOS from flash and the configuration from NVRAM. 0x2142 tells the router to bypass the configuration in NVRAM so that you can perform password recovery.- 3. The configuration register setting of 0x2102 provides what function to a router?
Options- A. Tells the router to boot into ROM monitor mode
- B. Provides password recovery
- C. Tells the router to look in NVRAM for the boot sequence
- D. Boots the IOS from a TFTP server Discuss
Correct Answer: Tells the router to look in NVRAM for the boot sequence
Explanation:
The default configuration setting of 0x2102 tells the router to look in NVRAM for the boot sequence.- 4. What is the purpose of flow control?
Options- A. To ensure that data is retransmitted if an acknowledgment is not received.
- B. To reassemble segments in the correct order at the destination device.
- C. To provide a means for the receiver to govern the amount of data sent by the sender.
- D. To regulate the size of each segment. Discuss
Correct Answer: To provide a means for the receiver to govern the amount of data sent by the sender.
Explanation:
Flow control allows the receiving device to control the transmitter so the receiving device's buffer does not overflow.- 5. Which three commands can be used to check LAN connectivity problems on a router?
- show interfaces
- show ip route
- tracert
- ping
- dns lookups
Options- A. 1 ,2 and 4
- B. 2 and 5
- C. 3 and 5
- D. None of the above Discuss
Correct Answer: 1 ,2 and 4
Explanation:
The tracert command is a Windows command and will not work on a router! A router uses the traceroute command.- 6. Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?
Options- A. Switch(config)# switchport trunk encapsulation isl
- B. Switch(config)# switchport trunk encapsulation ietf
- C. Switch(config)# switchport trunk encapsulation dot1q
- D. Switch(config-if)# switchport trunk encapsulation isl
- E. Switch(config-if)# switchport trunk encapsulation dot1q Discuss
Correct Answer: Switch(config-if)# switchport trunk encapsulation dot1q
Explanation:
If you are on a 2950 switch, then the interface command is just switchport mode trunk, since the 2950 can only run the IEEE 802.1Q version. However, a 3550 can run both ISL and 802.1Q, so you must use the encapsulation command. The argument to choose 802.1Q for a trunking protocol is dot1q.- 7. To test the IP stack on your local host, which IP address would you ping?
Options- A. 127.0.0.0
- B. 1.0.0.127
- C. 127.0.0.1
- D. 127.0.0.255 Discuss
Correct Answer: 127.0.0.1
Explanation:
To test the local stack on your host, ping the loopback interface of 127.0.0.1.- 8. Which command is used to determine if an IP access list is enabled on a particular interface?
Options- A. show access-lists
- B. show interface
- C. show ip interface
- D. show interface access-lists Discuss
Correct Answer: show ip interface
Explanation:
The show ip interface command will show you if any outbound or inbound interfaces have an access list set.- 9. Which command would you use to apply an access list to a router interface?
Options- A. ip access-list 101 out
- B. access-list ip 101 in
- C. ip access-group 101 in
- D. access-group ip 101 in Discuss
Correct Answer: ip access-group 101 in
Explanation:
To apply an access list, the proper command is ip access-group 101 in.- 10. Which of the following are true regarding OSPF areas?
- You must have separate loopback interfaces configured in each area.
- The numbers you can assign an area go up to 65,535.
- The backbone area is also called area 0.
- If your design is hierarchical, then you don't need multiple areas.
- All areas must connect to area 0.
Options- A. 1 only
- B. 1 and 2 only
- C. 3 and 4 only
- D. 3, 4 and 5 Discuss
Correct Answer: 3, 4 and 5
Explanation:
Loopback interfaces are created on a router, and the highest IP address on a loopback (logical) interface becomes the RID of the router but has nothing to do with areas and is optional, so (1) is wrong. The numbers you can create an area with are from 0 to 4,294,967,295 option (2) is wrong. The backbone area is called area 0, so option (3) is correct. All areas must connect to area 0, so option (5) is correct. If you have only one area, it must be called area 0. This leaves option (4), which must be correct; it doesn't make much sense, but it is the best answer.
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- 1. What are the two main types of access control lists (ACLs)?
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