Network and Security & Computers

ACL is part part of  Firewall. And Firewall is a whole security package.  Firewall is a complete network security device or software that monitors and filters incoming and outgoing network traffic based on the security policies applied.  An access control list (ACL) is a list of rules that specifies which users/systems/IP's are allowed or denied access to a particular system resource or network. 

It is a concept by which two different routing protocols can communicate and exchange routing information with each other.  Note: In below command OSPF shares routes learned from BGP Protocol with its OSPF neighbor.  router ospf 100 router-id 2.2.2.2 redistribute bgp 10 route -map iBGP2OSPF

Classful routing do not advertise the subnet mask information along with the network prefix, while classless routing do advertise subnet information. Hence by this in classless routing VLSM will not be supported, even if added or advertised it will still consider the default class of the subnet. 

How Does the Pakcte Flow in Checkpoint Firewall? SAM Database (Suspicious Activity Monitoring) Address Spoofing Session Lookup Policy Lookup Destination NAT Route Lookup Source NAT Layer 7 Inspection VPN Routing. Above is the various activities the cpaket is subjected to once a packet reaches a Checkpoint firewall.