![](/images/new-backgrounds/1306414/30641417x1.webp)
| SLIP |
| ISDN (PRI/BRI) |
| LLC2 |
| SDLC |
| |
| VLAN |
Network layer protocol | ARP |
| ARP Proxy |
| DNS |
| NAT |
| IP Filtering |
| ICMP |
| IGMP |
|
|
| DHCP client |
| NHRP |
Routing protocol | Static routing |
| |
| RIP v1, v2 |
| OSPF v1, v2 |
| |
| DDR |
| IP Multicasting |
| DVMRP |
| |
Security |
|
AAA | Radius |
| PAP |
| CHAP |
| TACAS+ |
Firewall | ACL |
| NAT |
VPN | L2TP |
| GRE |
| IPSec |
Quality of Service (QoS) | FIFO |
| PQ |
| CQ |
| CBWFQ |
| WFQ |
| RED |
| WRED |
| RTS |
|
|
| RSVP |
Network reliability | HSRP |
| Port backup |
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