Find the FTP reply whose message is wrongly matched.

• A. 331 €? username ok, password required
• B. 425 €? can’t open data connection
• C. 452 €? error writing file
• D. 452 €? can’t open data connection

The data transfer mode of FTP, in which all the fragmenting has to be done by TCP is ________

• A. Stream mode
• B. Block mode
• C. Compressed mode
• D. Message mode

The password is sent to the server using ________ command.

• A. Passwd
• B. Pass
• C. Password
• D. Pword

Datagram switching is done at which layer of OSI model?

• A. Network layer
• B. Physical layer
• C. Application layer
• D. Transport layer

Packets in datagram switching are referred to as ________

• A. Switches
• B. Segments
• C. Datagrams
• D. Data-packets

Datagram networks mainly refers to _________

• A. Connection oriented networks
• B. Connection less networks
• C. Telephone networks
• D. Internetwork

Datagrams are routed to their destinations with the help of ________

• A. Switch table
• B. Segments table
• C. Datagram table
• D. Routing table

The main contents of the routing table in datagram networks are ___________

• A. Source and destination address
• B. Destination address and output port
• C. Source address and output port
• D. Input port and output port

Which of the following remains same in the header of the packet in a datagram network during the entire journey of the packet?

• A. Destination address
• B. Source address
• C. Checksum
• D. Padding

Which of the following is true with respect to the delay in datagram networks?

• A. Delay is greater than in a virtual circuit network
• B. Each packet may experience a wait at a switch
• C. Delay is not uniform for the packets of a message
• D. All of the mentioned