ip/sec

• IP Connectivity

The ability of devices to communicate across the network using IP addressing and routing. Used with/for

• Routing Table

Database of routes used by a router to forward packets. Used with/for

• Administrative Distance (AD)

Trustworthiness rating of a routing source (lower number wins). Used with/for

• Metric

Value used within the same routing protocol to determine best path (lower is better). Used with/for

• Static Route

Manually configured route. Used with/for

• Dynamic Routing

Protocols that automatically learn and share routes. Used with/for

• Default Route

Route for unknown destinations (0.0.0.0/0). Used with/for

• Floating Static Route

Static route with higher AD. Used with/for

• OSPF (Open Shortest Path First)

Link-state routing protocol using Dijkstra algorithm. Used with/for

• OSPF Cost

Metric based on interface bandwidth (lower cost wins). Used with/for

• OSPF Area

Hierarchical division for scalability (Area 0 is backbone). Used with/for

• DR (Designated Router)

OSPF router elected on multi-access networks (highest priority or highest RID wins). Used with/for

• BDR (Backup Designated Router)

Backup to DR in OSPF. Used with/for

• Router ID (RID)

Unique 32-bit identifier for OSPF router (highest loopback or physical IP wins). Used with/for

• EIGRP (Enhanced Interior Gateway Routing Protocol)

Advanced distance vector protocol (Cisco proprietary). Used with/for

• EIGRP Metric

Composite metric based on bandwidth, delay, etc. (lowest wins). Used with/for

• show ip interface brief

Displays a summary table of interface status and IP addresses. Used with/for

• show ip interface

Shows detailed Layer 3 characteristics of interfaces including ACLs. Used with/for

• show ip route

Displays the IP routing table. Used with/for

• show running-config | section ip route

Filters running config to show only static routes. Used with/for

• ip route

Global config command to create static routes. Used with/for

• ping

Tests basic IP connectivity to a destination. Used with/for

• traceroute

Shows the path packets take to a destination. Used with/for

• router ospf 1

Enters OSPF configuration mode. Used with/for

• network x.x.x.x 0.0.0.0 area 0

OSPF command to enable on specific interface. Used with/for

• ip ospf area 0

Interface-level command to enable OSPF. Used with/for

• show ip ospf neighbor

Displays OSPF adjacencies. Used with/for

• passive-interface

Command to stop sending hellos while still advertising network. Used with/for

• router eigrp 100

Enters EIGRP configuration mode. Used with/for

• network x.x.x.x 0.0.0.0

EIGRP command to enable on interfaces. Used with/for

• show ip eigrp neighbors

Displays EIGRP neighbor table. Used with/for

• show ip protocols

Displays details about running routing protocols. Used with/for

• **clear ip route ***

Clears the routing table. Used with/for

• ip default-gateway

Configures default gateway on Layer 2 switches. Used with/for