Cisco CISCO2811-ADSL/K9 | 2811 Router with ADSL over POTS Bundle 4x Expansion Slot, 1 x nmE 2x 10/100Base-TX LAN, 2x USB

1. Dimensions: 17.25 x 16.4 x 1.75 in.
2. Weight: 13.2 lbs.
3. Power supply: AC 120/230 V (50/60 Hz)
4. RAM: 512 MB (installed) / 760 MB (max)
5. Flash Memory: 128 MB (installed) / 256 MB (max)
6. WAN ports: 2 x 10Base-T/100Base-TX/1000Base-T - RJ-45
7. LAN ports: 2 x 10Base-T/100Base-TX - RJ-45
8. Expansion slots: 4 (total) / 2 (free) x AIM ¦ 2 (total) / 1 (free) x NME-X ¦ 2 (total) / 1 (free) x EVM ¦ 1 (total) / 1 (free) x CompactFlash
9. Data Link Protocol: Ethernet, Fast Ethernet, Gigabit Ethernet
10. Network / Transport Protocol: IPSec, PPPoE, PPPoA, DHCP, DNS, L2TPv3, DDNS
11. Routing Protocol: OSPF, RIP-1, RIP-2, BGP, EIGRP, HSRP, VRRP, NHRP
12. Features: Firewall protection, VPN support, MPLS support, VLAN support, Syslog support, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ), Weighted Random Early Detection (WRED), Quality of Service (QoS), DHCP server, DNS proxy, DHCP relay, DHCP client

Helpful notes:
1. The Cisco 2811 Router is a highly reliable and scalable solution for small to medium-sized businesses.
2. It offers advanced security features, including firewall protection and VPN support, to ensure the safety of your network.
3. With its multiple expansion slots, the router can be easily customized to meet your specific networking needs.