Which Ethernet standards use 100BaseT media?

FastEthernet (FE) uses 100BaseT media standard with 100Mbps speed.

Which interface is used for VLAN tagging?

Subinterfaces are used for VLAN tagging in Router-on-a-Stick configurations.

Which commands verify interface status?

Both show interfaces status and show ip interface brief display interface status information.

What is the primary use of a loopback interface?

The primary use is to provide a stable, always-up virtual interface for network services, management, and testing. OSPF often uses it for Router ID persistence.

Which interfaces support 5G connectivity?

Cellular interfaces (4G/5G) provide backup connectivity for remote sites.

What does 'down/down' interface status indicate?

First 'down' indicates Layer 1 physical issue (no signals), second 'down' means administrative shutdown.

Which interface discards all traffic?

Null interface (Null0) is used to discard traffic and prevent routing loops.

What is required for GRE tunnel configuration?

GRE tunnels require tunnel source and tunnel destination parameters. Encryption is optional.

Which modern interface supports SD-WAN?

SD-WAN-Tunnel interfaces are used for cloud-connected branch offices.