Proposed Architecture Analysis

! Deny any other traffic access-list 111 deny ip any any log The above commands illustrate the concept of our layer 3 design, and would need to be expanded and modified in a production environment. Let's now consider a workgroup subnet populated with desktops but no servers. Since we don't expect servers to be placed here, inbound tcp traffic is limited:

IP stands for ‘Internet Protocol’ and is made of numbers and periods. It is the

The same implementation should be made for the server as well. In the server's case the firewall placed between it and any client should limit the quantity of connection from a source IP. The unfortunate side of this, and why the client firewall be implemented, is that many clients can be located behind one source IP address. This means that the server's firewall configuration needs to be more lenient the the client firewall.

Routers will have firewalls on them checking whether or not the information coming onto the network is allowed.

URL Filtering – URL filtering secures application servers by controlling client access. Sites that are known to be malicious or contain inappropriate content are blocked to protect the organization. TMG groups URLs into dozens of categories, including those based on security, productivity and

To reduce the risk of these types of attacks, routers should be hardened, packet filtering controls should be used and routing information should be controlled.

listens to the incoming connection requests from clients to alert the TCP/IP machine of the

It can perform an intelligent decision making on determining the best path for the packet reach its destination. It filters traffic by analyzing the source and destination IP addresses with its routing table.

The attacker counts the number of packet transmissions executed by each node in a region for a period of time. If the nodes are sending to a common destination node e.g., the sink node, then the latter should be located in a region of higher packet transmissions or

Now we suppose that network 192.168.3.0 fails. C stops routing packets to it and marks it as “unreachable” with

* Database Movement: Now, after blocking the access to the website that database will be

The public facing servers used to connect the internal webserver to the customer website are contained within the demilitarized zone. Due to the demilitarized zones proximity to the wide area network, we will be taking a layered security approach. There will be a statefull firewall located between the router and the demilitarized zone. This firewall will protect the internal network via the LAN-to-WAN connection by performing in-depth packet inspection and closely

In cases of emergency, the Government may invoke Rule 9 of the Blocking Rules which is titled “Blocking of Information in cases of Emergency”.

Alternative type of attack is called a Distributed Denial of Service (DDoS) attack. DDoS attacks are launched form numerous linked devices that are spread across the Internet. They are commonly harder to deflect, because of their sheer volume of devices involved. Unlike DoS attacks, DDoS assaults be apt to target the system infrastructure in an effort to drench it with huge volumes of traffic.

The type to information that the packet filtering firewall is able to examine include layer 3 and on occasion, layer 4 information as shown in the diagram below. “Cisco routers with standard ACLs can filter information at Layer 3, and Cisco routers with extended ACLs can filter information at both Layers 3 and 4.”(Cisco)