sw1#show run Building configuration... Current configuration : 1514 bytes ! ! Last configuration change at 10:30:56 UTC Mon May 11 2026 ! version 15.0 no service pad service timestamps debug datetime msec service timestamps log datetime msec no service password-encryption ! hostname sw1 ! boot-start-marker boot-end-marker ! ! ! no aaa new-model system mtu routing 1500 no ip domain-lookup ! ! ! ! ! ! ! ! ! ! ! spanning-tree mode pvst spanning-tree extend system-id ! vlan internal allocation policy ascending lldp run ! ! ! ! ! ! ! ! ! ! ! ! ! ! ! interface FastEthernet0/1 no lldp transmit no lldp receive ! interface FastEthernet0/2 no lldp transmit ! interface FastEthernet0/3 ! interface FastEthernet0/4 ! interface FastEthernet0/5 ! interface FastEthernet0/6 ! interface FastEthernet0/7 ! interface FastEthernet0/8 ! interface FastEthernet0/9 ! interface FastEthernet0/10 ! interface FastEthernet0/11 ! interface FastEthernet0/12 ! interface FastEthernet0/13 ! interface FastEthernet0/14 ! interface FastEthernet0/15 ! interface FastEthernet0/16 ! interface FastEthernet0/17 ! interface FastEthernet0/18 ! interface FastEthernet0/19 ! interface FastEthernet0/20 ! interface FastEthernet0/21 ! interface FastEthernet0/22 ! interface FastEthernet0/23 ! interface FastEthernet0/24 ! interface GigabitEthernet0/1 ! interface GigabitEthernet0/2 ! interface Vlan1 ip address 172.16.20.2 255.255.255.128 ! ip default-gateway 172.16.20.1 ip http server ip http secure-server ! ! ! no cdp run ! ! ! line con 0 line vty 5 15 ! ntp server 172.16.20.1 prefer source FastEthernet0/2 end sw1#show ip int brief Interface IP-Address OK? Method Status Protocol Vlan1 172.16.20.2 YES manual up up FastEthernet0/1 unassigned YES unset up up FastEthernet0/2 unassigned YES unset up up FastEthernet0/3 unassigned YES unset down down FastEthernet0/4 unassigned YES unset down down FastEthernet0/5 unassigned YES unset down down FastEthernet0/6 unassigned YES unset down down FastEthernet0/7 unassigned YES unset down down FastEthernet0/8 unassigned YES unset down down FastEthernet0/9 unassigned YES unset down down FastEthernet0/10 unassigned YES unset down down FastEthernet0/11 unassigned YES unset down down FastEthernet0/12 unassigned YES unset down down FastEthernet0/13 unassigned YES unset down down FastEthernet0/14 unassigned YES unset down down FastEthernet0/15 unassigned YES unset down down FastEthernet0/16 unassigned YES unset down down FastEthernet0/17 unassigned YES unset down down FastEthernet0/18 unassigned YES unset down down FastEthernet0/19 unassigned YES unset down down FastEthernet0/20 unassigned YES unset down down FastEthernet0/21 unassigned YES unset down down FastEthernet0/22 unassigned YES unset down down FastEthernet0/23 unassigned YES unset down down FastEthernet0/24 unassigned YES unset down down GigabitEthernet0/1 unassigned YES unset down down GigabitEthernet0/2 unassigned YES unset down down sw1#show ntp associations address ref clock st when poll reach delay offset disp *~172.16.20.1 .LOCL. 1 92 128 377 0.893 -6.074 3.534 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured