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- Question
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
- Correct Answer
- Decrease the window size
ExplanationA 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.
- 1. 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 Discuss
- 2. 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
- 3. which IOS command enables access to high-level commands?
Options- A. su root
- B. admin 0
- C. enable
- D. init Discuss
- 4. What port number is used for FTP control?
Options- A. 20
- B. 21
- C. 22
- D. 25 Discuss
- 5. 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
- 6. 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
- 7. 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
- 8. 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
- 9. 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
- 10. Which of the following connection mechanism is used by Ethernet?
Options- A. Token passing
- B. CSMA/CD
- C. CSMA/CA
- D. Host polling Discuss
CISCO Certification problems
Search Results
Correct Answer: Session
Explanation:
The Session layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex.
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: 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
Correct Answer: CSMA/CD
Explanation:
Ethernet networking uses Carrier Sense Multiple Access with Collision Detection (CSMA/CD), a protocol that helps devices share the bandwidth evenly without having two devices transmit at the same time on the network medium.
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