With no the ip name server and ip domain-name server command on a switch what happens to the switch and computer connected to that switch. Can the switch and the computer connected to the switch ping host names still without the command or no?
---results WITHOUT ip name-server configured on the router/switch---
RDC-Home#ping facebook.com Translating "facebook.com"...domain server (255.255.255.255) % Unrecognized host or address, or protocol not running.
---results WITH ip name-server configured on the router/switch---
RDC-Home(config)#ip name-server 220.127.116.11
! RDC-Home#ping facebook.com Translating "facebook.com"...domain server (18.104.22.168) [OK]
Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 22.214.171.124, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 348/350/352 ms
Likewise, devices connected to the switch will need to know which DNS server to contact to resolve hostname to IP address. A device can obtain a DNS IP address either via DHCP from a router or static IP config on the device itself.
Example of DHCP config on a router:
! ip dhcp pool LAN network 192.168.2.0 255.255.255.0 default-router 192.168.2.1 dns-server 126.96.36.199 188.8.131.52 !
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