# Router Configuration Reference Part 2

Traffic Filtering & Security

- **Filters / Access Control**
    - Access Control Lists (ACLs)
    - Firewall filter rules
    - Source and destination filtering
    - Port-based traffic filtering
    - Anti-spoofing policies
    - ICMP control
    - Management access restrictions
    - Traffic protection against unauthorized access

Route Filtering & Policy Control

- Prefix Lists
- Route Maps / Routing Policies
- AS Path Filters
- Community-based routing policies
- Import and export route filters
- Bogon and private ASN filtering

Interface Configuration

- Physical Ethernet interfaces
- VLAN interfaces (802.1Q)
- Trunk and Access port configuration
- Interface descriptions and labeling
- MTU configuration
- Speed and duplex settings
- Interface monitoring

Infrastructure Services

- DNS configuration
- NTP synchronization
- SNMP monitoring
- Syslog remote logging
- SSH secure management access
- User account and privilege management

Change Management

- Configuration backup before deployment
- Configuration validation after implementation
- Documentation updates
- Rollback procedures
- Post-change monitoring and verification