System information

84 Chapter 3: Defending the Perimeter
Cisco 2800 Series
The Cisco 2800 series of ISRs is designed for small-to-medium businesses and enterprise
branch offices. These routers can securely provide voice, data, and video services. Table 3-5
contrasts some of the features available in the Cisco 2801, 2811, 2821, and 2851 series of
ISRs.
Cisco 3800 Series
The Cisco 3800 series of ISRs is designed for medium to large businesses and enterprise
branch offices. These routers offer multiple security, IP telephony, video, network analysis,
and web application features. Table 3-6 contrasts some of the features available in the Cisco
3825 and 3845 series of ISRs.
Table 3-5 Cisco 2800 Series of ISRs
Feature
Cisco 2801
Series
Cisco 2811
Series Cisco 2821 Series Cisco 2851 Series
WAN
technology
support
ADSL and
optional G.SHDSL
WICs
ADSL and
optional G.SHDSL
WICs
ADSL and optional
G.SHDSL WICs
ADSL and optional
G.SHDSL WICs
Built-in routed/
WAN Ethernet
Two 10/100 Two 10/100 Two 10/100/1000 Two 10/100/1000
Integrated
cryptographic
hardware
Yes Yes Yes Yes
Maximum flash
memory
128 MB 256 MB 256 MB 256 MB
Maximum
SRAM
384 MB 769 MB 1024 MB 1024 MB
Support for
Cisco Security
Device
Manager (SDM)
Yes Yes Yes Yes
Maximum
number of VPN
tunnels
1500 1500 1500 1500
Stateful
firewall
support
Yes Yes Yes Yes
Intrusion
Prevention
System (IPS)
support
Yes Yes Yes Yes