CISCO Certification problems
- 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
Correct Answer: Session
Explanation:
The Session layer of the OSI model offers three different modes of communication : Simplex, half duplex, and full duplex.
- 2. 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
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.
- 3. 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
Correct Answer: Broadcast
Explanation:
A transmission to the MAC address ff : ff : ff : ff : ff : ff is a broadcast transmission to all stations.
- 4. 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
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
- 5. 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
Correct Answer: The Transport layer uses virtual circuits to create a reliable connection between two hosts
- 6. 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
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
- 7. Which of the following connection mechanism is used by Ethernet?
Options- A. Token passing
- B. CSMA/CD
- C. CSMA/CA
- D. Host polling Discuss
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.
- 8. Which part of a MAC address is called the organizationally unique identifier(OUI)?
Options- A. The first 24 bits, or 3 bytes
- B. The first 12 bits, or 3 bytes
- C. The first 24 bits, or 6 bytes
- D. The first 32 bits, or 3 bytes Discuss
Correct Answer: The first 24 bits, or 3 bytes
Explanation:
The first 24 bits, or 3 bytes, of a MAC address is called the organizationally unique identifier (OUI).
- 9. You want to implement a network medium that is not susceptible to EMI. Which type of cabling should you use?
Options- A. Thicknet coax
- B. Thinnet coax
- C. Category 5 UTP cable
- D. Fiber-optic cable Discuss
Correct Answer: Fiber-optic cable
Explanation:
Fiber-optic cable provides a more secure, long - distance cable that is not susceptible to EMI interference at high speeds.
- 10. Which of the following is part of the IEEE 802.3u standard?
Options- A. 100Base2
- B. 10Base5
- C. 100Base-TX
- D. 1000Base-T Discuss
Correct Answer: 100Base-TX
Explanation:
IEEE 802.3u is Fast Ethernet at 100Mbps and covers 100Base-TX, 100BaseT4, and 100Base-FX.
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