CISCO Certification problems
- 1. What is the subnet for host ID 10.16.3.65/23? Discuss
Correct Answer: A/23 is 2552552540 The third octet is a block size of 20, 2, 4 The subnet is in the 1620 subnet; the broadcast address is 163255
- 2. Which class of IP address provides a maximum of only 254 host addresses per network ID?
Options- A. Class A
- B. Class B
- C. Class C
- D. Class D Also asked in: Analyst, IT Trainer, Project Manager
Correct Answer: Class C
Explanation:
Class C network address has only 8 bits for defining hosts :
- 3. The network address of 172.16.0.0/19 provides how many subnets and hosts?
Options- A. 7 subnets, 2046 hosts each
- B. 7 subnets, 8190 hosts each
- C. 8 subnets, 2046 hosts each
- D. 8 subnets, 8190 hosts each Discuss
Correct Answer: 8 subnets, 8190 hosts each
Explanation:
A CIDR address of/19 is 255.255.224.0. This is a Class B address, so that is only 3 subnet bits, but it provides 13 host bits, or 8 subnets, each with 8,190 hosts.
- 4. Convert 10100010111101011001110110001011 2 to dotted decimal. Discuss
Correct Answer: Convert to dotted hexadecimal first, and then convert each hexadecimal number pair to decimal A2F59D8B then 162245157139
- 5. At which layer is routing implemented , enabling connections and path selection between two end systems? Discuss
Correct Answer: The Network layer provides routing through an internetwork and logical addressing
- 6. Which layer defines how data is formatted , presented, encoded, and converted for use on the network? Discuss
Correct Answer: The presentation layer makes sure that data is in a readable format for the Application layer
- 7. If a switch has three computers connected to it, with no VLANs present, how many broadcast and collision domains is the switch 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 three collision
Explanation:
If a switch has three computersconnected to it, with no VLANs present , one broadcast and three collision domains are created.
- 8. What must happen if a DHCP IP conflict occurs?
Options- A. Proxy ARP will fix the issue
- B. The client uses a gratuitous ARP to fix the issue
- C. The administrator must fix the conflict by hand at the DHCP server
- D. The DHCP server will reassign new IP addresses to both computers Discuss
Correct Answer: The administrator must fix the conflict by hand at the DHCP server
Explanation:
If a DHCP Conflict is detected, either by the server sending a ping and getting response or by a host using a gratuitous ARP (arp'ing for its own IP address and seeing if a host responds), then the server will hold that address and not use it again until it is fixed by an administrator.
- 9. Which OSI layer defines the standards for cabling and connectors?
Options- A. Layer 1
- B. Layer 4
- C. Layer 7
- D. Layer 3 Also asked in: Network Engineer
Correct Answer: Layer 1
Explanation:
OSI layer 1 defines the standards for cabling and connectors.
- 10. Which layer combines bits into bytes and bytes into frames, uses MAC addressing , and provides error detection? Discuss
Correct Answer: The Data Link layer is responsible for the framing of data packets
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