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Q. Explain Dynamic Domain Name System?
DDNS
- Dynamic Domain Name System automatically updates the DNS master file
- Sent by DHCP to a primary DNS server; secondary servers are notified
Encapsulation
- DNS uses either UDP or TCP to send request, response messages using a well-known port
- UDP for messages less than 512 bytes
- Otherwise uses TCP
Can you describe circuit level gateway?
Explain the term- Encryption Because all of the user traffic, as well as control traffic, is digitized in second generation systems, it is a relatively simple matter to encrypt
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