Cisco Systems 520 Manual De Usuario

The Cisco Secure Router 520 Series routers support the following types of memory:

Flash memory stores the image of the ROMMON boot code, the Cisco IOS software, and the router 
configuration file. By default, the router ships with 36 MB of flash memory, with no option for 
expansion. The router has enough memory to support the Cisco IOS Advanced IP Services image.

SDRAM stores the Cisco IOS software and provides memory for data that is created during packet 
processing. The router provides 128 MB of onboard SDRAM.

Each Cisco Secure Router 520 Series router has a Kensington security slot on the back panel. To secure 
the router to a desktop or other surface, use the Kensington lockdown equipment.

 summarizes the features of the Cisco Secure Router 520 Series routers.

Security features

Provides advanced security features, including secure VPN access and 
comprehensive threat defense with Cisco IOS Firewall, IPS, and URL filtering. The 
Cisco Secure Router 520 Series routers also provides dynamic routing and 
advanced QoS features. 

IPsec hardware accelerator

The security processor implements symmetric key encryption, public key 
encryption, authentication, and data compression in hardware.

Integrated 802.11b/g radio module

(Wireless routers only) Provides connectivity to a wireless LAN using IEEE 
802.11b/g standards. Enables the router to act as an access point (AP) in 
infrastructure mode.

Flash memory

36 MB of flash memory (default) with no option for expansion. The router has 
enough memory to support the Cisco IOS Advanced IP Services image.

SDRAM

128 MB of SDRAM on board.

Dying gasp

Detects whether the router is about to lose power, and then sends a signal to warn 
the digital subscriber line access multiplexer (DSLAM) about the impending line 
drop.