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- Question
Which layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex?
Options- A. Presentation
- B. Transport
- C. Application
- D. Session
- Correct Answer
- Session
ExplanationThe Session layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex.
- 1. When data is encapsulated , which is the correct order?
Options- A. Data, frame, packet, segment, bit
- B. Segment, data, packet, frame, bit
- C. Data, segment, packet, frame, bit
- D. Data, segment, frame, packet, bit Discuss
- 2. which IOS command enables access to high-level commands?
Options- A. su root
- B. admin 0
- C. enable
- D. init Discuss
- 3. What port number is used for FTP control?
Options- A. 20
- B. 21
- C. 22
- D. 25 Discuss
- 4. Given the following network range 192.168.0.0/24. We want minimum 50 hosts on each of the available subnets. What will be the subnet mask?
Options- A. /24
- B. /25
- C. /26
- D. /27 Discuss
- 5. You are the network administrator and are given the tasks to plan for the future expansion of the network. You decide to subnet the current network of 172.15.0.0. What will be the subnet mask be if every subnet has to allocate 500 hosts.
Options- A. 255.255.0.0
- B. 255.0.0.0
- C. 255.255.240.0
- D. 255.255.254.0 Discuss
- 6. A receiving host has failed to receive all of the segments that it should acknowledge. What can the host do to improve the reliability of this communication session?
Options- A. Send a different source port number
- B. Restart the virtual circuit
- C. Decrease the sequence number
- D. Decrease the window size Discuss
- 7. When a station sends a transmission to the MAC address ff : ff : ff : ff : ff : ff, what type of transmission is it?
Options- A. Unicast
- B. Multicast
- C. Anycast
- D. Broadcast Discuss
- 8. If a hub has three computers connected to it, how many broadcast and collision domains is the hub creating?
Options- A. Three broadcast and one collision
- B. Three broadcast and three collision
- C. one broadcast and three collision
- D. One broadcast and one collision Discuss
- 9. Which layer is used for reliable communication between end nodes over the network and provides mechanisms for establishing , maintaining , and terminating virtual circuits; transport - fault detection and recovery; and controlling the flow of information? Discuss
- 10. Which layer ensures the trustworthly transmission of data across a physical link and is primarily concerned with physical addressing, line discipline, network topology, error notification, ordered delivery of frames, and flow control? Discuss
CISCO Certification problems
Search Results
Correct Answer: Data, segment, packet, frame, bit
Explanation:
The encapsulation method is data, segment, packet, frame, bit.
Correct Answer: enable
Correct Answer: 21
Correct Answer: /26
Explanation:
Explanation: 50 hosts require 6 bits of the last octet giving us 64 -2 = 62 possible hosts this satisfies our requirement and leaves us 2 bits over for the subnets. The default mask is /24 or 255.255.255.0 adding the 2 bits for the subnets it becomes 255.255.255.192 or /26
Correct Answer: 255.255.254.0
Explanation:
Explanation: The requirement of having to allocate 500 hosts on each subnet can be achieved by the following: 2^9 = 512. So deducting the broadcast and network address we have 510 possible hosts on each subnet. We used 9 bits to allocate the hosts, this leaves us 7 bits for possible subnets. Those 7 bits in binary is 1111 1110 or 254 in decimal.
Correct Answer: Decrease the window size
Explanation:
A receiving host can control the transmitter by using flow control ( TCP uses windowing by default). By decreasing the window size, the receiving host can slow down the transmitting host so the receiving host does not overflow its buffers.
Correct Answer: Broadcast
Explanation:
A transmission to the MAC address ff : ff : ff : ff : ff : ff is a broadcast transmission to all stations.
Correct Answer: One broadcast and one collision
Explanation:
If a hub has three computers connected to it, one broadcast and one collision domain is created
Correct Answer: The Transport layer uses virtual circuits to create a reliable connection between two hosts
Correct Answer: PDUs at the data link layer are called frames and provide physical addressing, plus other options to place packets on the network medium
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