ICMP
Pretty much every protocol used for malicious traffic and Trojans is also used for legitimate traffic. You cannot block all bad traffic just by filtering on protocols. When given that ICMP and HTTP are both allowed, if you have to block one, block ICMP. Choices were: DNS DHCP ICMP HTTP https://library.skillport.com/courseware/cbtlib/TPSY0201/metadata/eng/TPSY0201B.htm?
Generally traffic exiting a LAN is controlled at the router or firewall by setting rules in the configuration files for the router or firewall restricting what IP addresses traffic can be sent to, what devices outbound traffic can be sent from. You can also set rules controlling what outbound ports, protocols, and services will be blocked or allowed. Generally the best way to configure is "deny all and allow by exception" where all traffic is blocked by default and then rules are inserted to allow exceptions for specific traffic. You would also insert settings into the Access Control List.
the street was blocked by traffic
IDS
Routed protocols are the best paths in a network along which to send network traffic.
The simplest way to filter network traffic is by using a firewall, which can be configured to allow or block traffic based on predefined rules such as IP addresses, ports, and protocols. Additionally, implementing access control lists (ACLs) on routers can also help in filtering traffic by specifying which packets are permitted or denied. For more granular control, using intrusion detection systems (IDS) can help identify and filter malicious traffic.
blocked lanes
There are more than 3 protocols at the application layer. Three well-known protocols are: HTTP - web page traffic FTP - file transfer traffic SMTP - email transfer
The simplest method of filtering traffic is using a basic access control list (ACL) on a router or firewall. This approach allows you to define rules that permit or deny traffic based on criteria such as IP addresses, protocols, or port numbers. By specifying what types of traffic are allowed or blocked, you can effectively manage and control the flow of data through your network. ACLs are straightforward to implement and can be customized to fit specific security needs.
To test a network for blocked traffic, you can use tools like ping or traceroute to check connectivity to specific hosts and identify any interruptions. Additionally, employing network packet analyzers like Wireshark can help monitor traffic and identify where packets are being dropped or blocked. Running port scans with tools such as Nmap can also reveal which ports are accessible or blocked. Finally, analyzing firewall rules and configurations is crucial to understand potential restrictions in traffic flow.
Organizations can prevent data breaches caused by leaky channels by implementing strong encryption protocols, regularly monitoring network traffic for unusual activity, restricting access to sensitive data, and providing cybersecurity training to employees.
protocols, TCP/IP headers, attack signatures, prot numbers