In OSPF header, which field is used to detect errors in the packet?

• A. Type
• B. Area id
• C. Authentication type
• D. Checksum

In OSPF database descriptor packet, if there are more database descriptor packets in the flow, ‘M’ field is set to ____________

• A. 1
• B. 0
• C. More
• D. -1

In OSPF database descriptor packet, which field is used to indicate that the router is master?

• A. M
• B. Ms
• C. I
• D. Options

In OSPF database descriptor packet, which field is used to detect a missing packet?

• A. Lsa header
• B. Ms
• C. Database descriptor sequence number
• D. Options

Network layer firewall works as a __________

• A. Frame filter
• B. Packet filter
• C. From the dangers of unknown resources on the internet and other network connections that may be harmful. the firewall prevents unauthorized access to your internal, trusted network from outside threats.
• D. Virus filter

Network layer firewall has two sub-categories as _________

• A. State full firewall and stateless firewall
• B. Bit oriented firewall and byte oriented firewall
• C. Frame firewall and packet firewall
• D. Network layer firewall and session layer firewall

A firewall is installed at the point where the secure internal network and untrusted external network meet which is also known as __________

• A. Chock point
• B. Meeting point
• C. Firewall point
• D. Secure point

Which of the following is / are the types of firewall?

• A. Packet filtering firewall
• B. Dual homed gateway firewall
• C. Screen host firewall
• D. Dual host firewall

A proxy firewall filters at _________

• A. Physical layer
• B. Data link layer
• C. Network layer
• D. Application layer

A packet filter firewall filters at __________

• A. Physical layer
• B. Data link layer
• C. Network layer or transport layer
• D. Application layer