A network technician is troubleshooting connectivity issues at a newly configured remote office. Several workstations display 'Limited or No Connectivity' notifications. Executing `ipconfig /all` on an affected client yields an IPv4 address of , a subnet mask of , and an empty default gateway entry. When a technician assigns a valid static IP address, subnet mask, gateway, and DNS server to a workstation, full internet and internal network connectivity is immediately restored. Which server role is failing to supply automated network parameters, and which protocol ports must be allowed through local firewalls to enable this service?
- DHCP server using UDP ports 67 and 68Cevap
- BDNS server using TCP and UDP port 53
- CDHCP server using TCP ports 53 and 80
- DProxy server using UDP ports 169 and 254
Cevap
The DHCP server service operating on UDP ports 67 and 68 is failing to reach the clients or is blocked by network filters.
An IP address in the range of 169.254.0.1 through 169.254.255.254 indicates that the operating system engaged Automatic Private IP Addressing (APIPA) due to an inability to contact a Dynamic Host Configuration Protocol (DHCP) server. DHCP handles automated allocation of IP addresses, subnet masks, default gateways, and DNS server addresses across a network. DHCP communicates using UDP port 67 on the server side and UDP port 68 on the client side.
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Anahtar Kavram
Network Host Services and Server Roles (DHCP vs DNS and APIPA Diagnosis)