Computer Networking
What is the main difference between DDCMP and SDLG?

DDCMP does not need special hardware to final the beginning of a message.
SDLC has a IP address
SDLC does not use CRC
None of these
DDCMP has a message header

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Computer Networking
In geosynchronous orbit, satellite

None of these
remains in a fixed position related to points on earth
remains in a fixed position so that as earth rotates, it can fully cover the earth
moves faster than the earth's rotation so that it can cover larger portion of earth.
moves simultaneously

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Computer Networking
If you wanted to deny FTP access from network 200.200.10.0 to network 200.199.11.0 but allow everything else, which of the following command strings is valid?

access-list 198 deny tcp 200.200.10.0 0.0.0.255 200.199.11.0 0.0.0.255 eq ftpaccess-list 198 permit ip any 0.0.0.0 255.255.255.255
access-list 1 deny ftp 200.200.10.0 200.199.11.0 any any
access-list 100 deny tcp 200.200.10.0 0.0.0.255 200.199.11.0 0.0.0.255 eq ftp
access-list 110 deny 200.200.10.0 to network 200.199.11.0 eq ftpaccess-list 111 permit ip any 0.0.0.0 255.255.255.255

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