During a network troubleshooting session, a network engineer notices that the expected IP address allocation via DHCP is not occurring for new client devices. Assuming the DHCP server is operational and correctly configured, which of the following port filtering scenarios could most likely be responsible for this issue?
UDP port 53 is closed on the server
TCP port 22 filtering is enabled on the client side
If a firewall or network device is blocking DHCP communications, it may be set to filter out traffic on UDP ports 67 and 68. These ports are essential for DHCP operations, where port 67 is used by the server to receive client requests and port 68 is used by clients to receive server responses. Blocking these ports would prevent DHCP server-client communication, resulting in a failure to allocate IP addresses.
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Why does DHCP use UDP instead of TCP?
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What happens during the DHCP handshake process?
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How can a network engineer check if ports 67 and 68 are blocked?