总结如下：

　　1、关闭一些全局的不安全服务如下：

　　Finger

　　PAD

　　Small Servers

　　Bootp

　　HTTP service

　　Identification Service

　　CDP

　　NTP

　　Source Routing

　　2、开启一些全局的安全服务如下：

　　Password-encryption service

　　Tuning of scheduler interval/allocation

　　TCP synwait-time

　　TCP-keepalives-in and tcp-kepalives-out

　　SPD configuration

　　No ip unreachables for null 0

　　3、关闭接口的一些不安全服务如下：

　　ICMP

　　Proxy-Arp

　　Directed Broadcast

　　Disables MOP service

　　Disables icmp unreachables

　　Disables icmp mask reply messages.

　　4、提供日志安全如下：

　　Enables sequence numbers & timestamp

　　Provides a console log

　　Sets log buffered size

　　Provides an interactive dialogue to configure the logging server ip address.

　　5、保护访问路由器如下：

　　Checks for a banner and provides facility to add text to automatically configure：

　　Login and password

　　Transport input & output

　　Exec-timeout

　　Local AAA

　　SSH timeout and ssh authentication-retries to minimum number

　　Enable only SSH and SCP for access and file transfer to/from the router

　　6、保护转发Forwarding Plane

　　Enables Cisco Express Forwarding （CEF） or distributed CEF on the router， when available

　　Anti-spoofing

　　Blocks all IANA reserved IP address blocks

　　Blocks private address blocks if customer desires

　　Installs a default route to NULL 0， if a default route is not being used

　　Configures TCP intercept for connection-timeout， if TCP intercept feature is available and the user is interested

　　Starts interactive configuration for CBAC on interfaces facing the Internet， when using a Cisco IOS Firewall image，

　　Enables NetFlow on software forwarding platforms