Discussion
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- Question
What does a firewall?
Options- A. Examines packets and decides which ones should be allowed to pass from one network to another.
- B. Maintains a table which maps the IP addresses of two network so that packets can be redirected between the networks.
- C. Compares packets to virus signatures so that packets which are know to be dangerous can be identified and stopped.
- D. Prevents viruses from moving any further through a network
- Correct Answer
- Examines packets and decides which ones should be allowed to pass from one network to another.
- 1. What port number is used for DHCP?
Options- A. 67
- B. 68
- C. 69
- D. Both A and B Discuss
- 2. What are the six OSPF route types? Discuss
- 3. What are the purposes of areas in an OSPF network? Discuss
- 4. Explain the difference between the forwarding of a unicast IP packet and the forwarding of a multicast IP packet. Discuss
- 5. Which of the following describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols?
Options- A. HDLC
- B. Cable
- C. VPN
- D. IPSec Discuss
- 6. Which of the following devices do not operate at all levels of the OSI model?
Options- A. Network management stations (NMSs)
- B. Routers
- C. Web and application servers
- D. Network hosts Discuss
- 7. Acknowledgments, sequencing , and flow control are characteristics of which OSI layer?
Options- A. Layer 2
- B. Layer 3
- C. Layer 4
- D. Lawer 7 Discuss
- 8. Which layer chooses and determines the availability of communicating partners along with the resources necessary to make the connection, coordinates partnering applications, and forms a consensus on procedures for controlling data integrity and error recovery? Discuss
- 9. What is the bit length and expression form of a MAC address? Discuss
- 10. Differentiate a MAC address and an IP address and describe how and when each address type is used in a network? Discuss
CISCO Certification problems
Search Results
Correct Answer: Both A and B
Correct Answer: Intra-area, inter area, El, E2, Nl, and N2
Correct Answer: Areas allow the design of a hierarchical network Routes can be summarized or blocked in an area to reduce the amount of routing information on internal OSPF routers
Correct Answer: Unicast IP packets are forwarded based on the destination IP address Multicast packets are forward based on the source IP address If a multicast packet is received on the interface used to send a unicast packet back to the source, the multicast packet is forwarded to multicast neighbors If the multicast packet is received on an interface that would not be used to send a unicast IP packet back to the source, the packet is discarded
Correct Answer: VPN
Explanation:
A VPN allows or describes the creation of private networks across the Internet, enabling privacy and tunneling of non-TCP/IP protocols. A VPN can be set up across any type of link.
Correct Answer: Routers
Explanation:
Routersoperate no higher than layer 3 of the OSI model.
Correct Answer: Layer 4
Explanation:
A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. A reliable connection is defined by a virtual circuit that uses acknowledgments, sequencing, and flow control, which are characteristics of the transport layer.
Correct Answer: The application layer is responsible for finding the network resources broadcast from a server and adding flow control and error control (if the application developer chooses)
Correct Answer: 48 bits (6 bytes) expressed as a hexadecimal number
Correct Answer: A MAC address is a hexadecimal number identifying the physical connection of a host MAC addresses are said to operate on layer 2 of the OSI model IP addresses, which can be expressed in binary or decimal format, are logical identifiers that are said to be on layer 3 of the OSI model Hosts on the same physical segment locate one another with MAC addresses, while IP addresses are used when they reside on different LAN segments or subnets Even when the hosts are in different subnets , a destination IP address will be converted to a MAC address when the packet reaches the destination network via routing
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