By Omar Santos
End-to-End community defense is designed to counter the recent iteration of complicated threats. Adopting this strong safety method defends opposed to hugely refined assaults which could ensue at a number of destinations on your community. the last word objective is to set up a collection of safeguard functions that jointly create an clever, self-defending community that identifies assaults as they ensue, generates signals as acceptable, after which immediately responds. End-to-End community protection provide you with a complete examine the mechanisms to counter threats to every a part of your community. The publication starts off with a evaluation of community defense applied sciences then covers the six-step method for incident reaction and top practices from proactive protection frameworks. Later chapters conceal instant community protection, IP telephony safety, info middle safeguard, and IPv6 protection. eventually, a number of case stories representing small, medium, and big companies supply designated instance configurations and implementation thoughts of most sensible practices realized in previous chapters.
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Additional info for End-to-End Network Security: Defense-in-Depth
In Virtual Gateway mode, the CAS acts as a bridge. DHCP client routes point directly to network devices on the protected network. Figure 1-13 shows a CAS conﬁgured in Real IP mode. 123/24 In Real IP mode, the CAS acts as a Layer 3 router. In this example, the CAS trusted and untrusted interfaces are in different subnets. 0/24. In Real IP mode, DHCP clients usually point to the CAS to obtain their IP addresses and other DHCP information. It is a best practice to assign a 30-bit address to the DHCP clients.
The state of the connection details whether such connection has been established, closed, reset, or is being negotiated. These mechanisms offer protection for different types of network attacks. Cisco IOS ﬁrewall, Cisco Adaptive Security Appliances (ASA), Cisco PIX ﬁrewalls, and the Cisco Firewall Services Module (FWSM) for the Cisco Catalyst 6500 series switches are examples of stateful ﬁrewalls. They also have other rich features such as deep packet inspection. 10 Chapter 1: Overview of Network Security Technologies NOTE For detailed deployment, conﬁguration, and troubleshooting information, see the Cisco Press book titled Cisco ASA: All-in-One Firewall, IPS, and VPN Adaptive Security Appliance.
CAS can be deployed in in-band (IB) or out-of-band (OOB) modes. CASs can pass trafﬁc in one of two ways: • • NOTE Bridged mode: Typically called Virtual Gateway mode Routed mode: In Real IP Gateway or NAT Gateway conﬁgurations You can conﬁgure the CASs in either mode, but only in one mode at a time. For example, if you conﬁgure a CAS in Virtual Gateway conﬁguration, you cannot also conﬁgure it as a Real IP Gateway. This is because the mode selection affects the logical trafﬁc path. Figure 1-12 illustrates a CAS conﬁgured in Virtual Gateway mode.