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- Question
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
- Correct Answer
- /26
ExplanationExplanation: 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
- 1. 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
- 2. What is the purpose of the LOCAL_PREF attribute? Discuss
- 3. Assume a router has a loopback address of 135.77.9.254. Convert the loopback address to an IS-IS system ID. Discuss
- 4. What protocol would you use if you were running xDSL and needed authentication? Discuss
- 5. 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 seperate subinterface for each PVC with a unique DLCI and subnet assigned to the subinterface
- B. Combine multiple Frame Relay circuits 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
- 6. What port number is used for FTP control?
Options- A. 20
- B. 21
- C. 22
- D. 25 Discuss
- 7. which IOS command enables access to high-level commands?
Options- A. su root
- B. admin 0
- C. enable
- D. init Discuss
- 8. 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
- 9. 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
- 10. 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
CISCO Certification problems
Search Results
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: If a router has more than one route to the same IP prefix, the best path is the one with the highest LOCAL_PREF (assuming the WEIGHT attribute for the routes is equal)
Correct Answer: The loopback address written in dotted decimal and using three digits for each byte has a value of 135077009254 The system ID is 135077009254
Correct Answer: PPPoE or PPPoA
Correct Answer: Configure a seperate 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.
Correct Answer: 21
Correct Answer: enable
Correct Answer: Data, segment, packet, frame, bit
Explanation:
The encapsulation method is data, segment, packet, frame, bit.
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: 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.
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