Defending the Perimeter from Cyber Attacks Training

GCHQ Certified Training Course
Qualification level
GCHQ Certified Training Course
Study type
Distance learning
View Website
View Website

About the course

This Defending the Perimeter from Cyber Attacks course will teach you to ensure the confidentiality, integrity, and availability of your organization’s information by protecting your communications and data. You will learn how to define and implement security principles, install and customise secure firewalls, build Virtual Private Network (VPN) tunnels, and safeguard your organization’s network perimeter against malicious attacks.


Key Features of this Defending the Perimeter Training:

  • After-course instructor coaching benefit
  • Learning Tree end-of-course exam included

You Will Learn How To:

  • Fortify your network perimeter to provide an integrated defence
  • Prevent or mitigate the effects of network attacks with a firewall
  • Detect and respond to network attacks with Intrusion Detection and Prevention (IDP)
  • Design, install, and configure secure Virtual Private Networks (VPNs)
  • Mitigate the impact of Denial-of-Service (DoS) attacks


Important Defending the Perimeter Course Information

Recommended Experience

  • Basic security knowledge at the level of:
    • System and Network Security Introduction Training • Course 468
  • Working knowledge of TCP/IP and client server architecture


Defending the Perimeter Course Outline

Setting Your Security Objectives

Defining security principles

  • Ensuring data Confidentiality, Integrity and Availability (CIA)
  • Assessing defensive techniques
  • Setting a generic security stance

Developing a security policy

  • Balancing risk with business requirements
  • Identifying your information assurance objectives
  • Choosing security technologies

Deploying a Secure Firewall

Installing a firewall

  • Determining the appropriate firewall type
  • Selecting and hardening the operating system
  • Virtualising the firewall appliance

Configuring a firewall to support outgoing services

  • Supporting simple services: HTTP, SMTP
  • Filtering dangerous content and handling encrypted traffic
  • Managing complex services: VoIP, audio and video

Providing external services securely

  • Implementing publicly accessible servers
  • Building a DMZ architecture
  • Supporting SMTP mail

Allowing access to internal services

  • Customising DNS for firewall architectures
  • Configuring Network Address Translation (NAT)
  • Developing access lists for client server applications

Detecting and Preventing Intrusion

Deploying an IDS

  • Placing Network IDS (NIDS) within your network architecture
  • Operating sensors in stealth mode

Detecting intrusions in the enterprise

  • Designing a multi-layer IDS hierarchy
  • Managing distributed IDS

Interpreting alerts

  • Verifying IDS operation
  • Minimising false positives and negatives
  • Validating IDS events and recognising attacks

Stopping intruders

  • Exploiting IDS active responses
  • Snipping a TCP session
  • Controlling access with a firewall update

Configuring Remote User Virtual Private Networks (VPNs)

Building VPN tunnels

  • Compulsory vs. voluntary tunnels
  • Supporting remote users with layer 2 tunnels
  • Connecting remote sites with layer 3 tunnels

Deploying client software

  • Assessing remote access VPN alternatives
  • Implementing remote user authentication
  • Leveraging Layer 2 Tunnelling Protocol (L2TP)
  • Protecting L2TP tunnels with IPsec Transport Mode

Creating Site-to-Site VPNs

Applying cryptographic protection

  • Ensuring confidentiality with symmetric encryption
  • Exchanging symmetric keys with asymmetric encryption
  • Checking message integrity with hashing
  • Managing digital certificates with PKI

Comparing tunnelling and protection methods

  • Employing VPN concentrators and VPN-capable routers
  • Applying IPsec Tunnel Mode
  • Assessing tunnelling protocols
  • Evaluating VPN topologies

Integrating Perimeter Defences

Reducing the impact of denial-of-service (DoS) attacks

  • Mitigating bombardment attacks
  • Rejecting connection-based attacks with IPSs
  • Blackholing and sinkholing
  • Implementing a DoS Defence System (DDS)
  • Blacklisting attack sites and address ranges

Perimeter architectures

  • Integrating IDS and VPNs with your firewall architecture
  • Positioning externally accessible servers
  • Monitoring and controlling wireless networks


Defending the Perimeter Training FAQs

Can I learn to defend the perimeter from cyber attacks online?

Yes! We know your busy work schedule may prevent you from getting to one of our classrooms which is why we offer convenient online training to meet your needs wherever you want. This course is available in class and live online.



Contact the course provider: