User Datagram Protocol
- Designed in conjunction with IP
- Interface to services
- If I want to allow an IPsec negotiation we have to use IKE
- Executable running in memory waiting for our commands
- Unreliable delivery
- In real time applications we use unreliable delivery
- It is what UDP is built for.
- Has less overhead than a TCP would have.
Use Cases
- Domain name queries
- Realtime audio applications
- Realtime video applications
- Simple transfers
- FTP
- It's clear text
- Requires authentication
- TFTP
- File repository that you can easily read and write for.
- Send a query and it doesn't care who you are so you are granted access.
- VoIP
- Polling
- Simple Network Management Protocol (SNMP)
- Query the device for:
- CPU %, MEM %, Storage %, INT0, INT1
- How are your resources? how do we check that? By polling
- The more often you polling the best but the more often you poll the greater the bandwidth.
- Clients want to see performance.
- Multicast
- Typically for streaming video and audio
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