What is the main advantage of UDP?

• A. More overload
• B. Reliable
• C. Low overhead
• D. Fast

Port number used by Network Time Protocol (NTP) with UDP is ________

• A. 161
• B. 123
• C. 162
• D. 124

What is the header size of a UDP packet?

• A. 8 bytes
• B. 8 bits
• C. 16 bytes
• D. 124 bytes

The port number is “ephemeral port number”, if the source host is _______

• A. Ntp
• B. Echo
• C. Server
• D. Client

“Total length” field in UDP packet header is the length of _________

• A. .
• B. Only data
• C. Only checksum
• D. Udp header plus data

Which is the correct expression for the length of UDP datagram?

• A. Udp length = ip length €? ip header’s length
• B. Udp length = UDP length €? UDP header’s length
• C. Udp length = ip length + ip header’s length
• D. Udp length = UDP length + UDP header’s length

The ______ field is used to detect errors over the entire user datagram.

• A. Udp header
• B. Checksum
• C. Source port
• D. Destination port

Which mode of IPsec should you use to assure the security and confidentiality of data within the same LAN?

• A. Ah transport mode
• B. Esp transport mode
• C. Esp tunnel mode
• D. Ah tunnel mode

Which two types of encryption protocols can be used to secure the authentication of computers using IPsec?

• A. Kerberos v5
• B. Sha
• C. Md5
• D. Both sha and md5

Which two types of IPsec can be used to secure communications between two LANs?

• A. Ah tunnel mode
• B. Esp tunnel mode
• C. Both ah tunnel mode and esp tunnel mode
• D. Esp transport mode