Quiz Entry - updated: 2026.07.14
What commands display the ARP table on Cisco routers and Windows PCs?
Use show ip arp on a Cisco router and arp -a on a Windows PC to display the cached IPv4-to-MAC mappings.
ARP Table Display Commands:
| Device | Command | Description |
|---|---|---|
| Cisco Router | show ip arp |
Displays Protocol, Address, Age, Hardware Addr, Type, Interface |
| Windows PC | arp -a |
Displays Interface, Internet Address, Physical Address, Type |
ARP entry types:
- Dynamic - Learned automatically via ARP process
- Static - Manually configured by administrator
Example Windows arp -a output:
Internet Address Physical Address Type
192.168.1.1 c8-d7-19-cc-a0-86 dynamic
192.168.1.255 ff-ff-ff-ff-ff-ff static ← Broadcast
224.0.0.22 01-00-5e-00-00-16 static ← Multicast
Note: Broadcast (255) and multicast (224.x.x.x) addresses have static ARP entries because their MAC addresses are predefined.
Go deeper:
-
Address Resolution Protocol — Wikipedia explains dynamic vs static ARP entries that these commands display. -
Multicast address — Ethernet — why multicast/broadcast IPs map to predefined MACs and so appear as static ARP entries.