tailieunhanh - Bài giảng Mạng máy tính nâng cao (Advanced computer networks) - Chapter 08: Access control list

ACL tell the router what types of packets to accept or deny. Acceptance and denial can be based on specified conditions. ACLs enable management of traffic and secure access to and from a network. | Chapter 08 ACCESS CONTROL LIST MẠNG MÁY TÍNH NÂNG CAO What are ACLs: ACCES CONTROL LIST ACL tell the router what types of packets to accept or deny. Acceptance and denial can be based on specified conditions. ACLs enable management of traffic and secure access to and from a network What are ACLs The router examines each packet to determine whether to forward or drop it, based on the conditions specified in the ACL What are ACLs ACLs can be created for all routed network protocols, such as Internet Protocol (IP) and Internetwork Packet Exchange (IPX). ACLs must be defined on a per-protocol, per direction, or per port basis The Primary Reasons to Create ACLs Limit network traffic and increase network performance. For example By restricting video traffic Provide traffic flow control. ACLs can restrict the delivery of routing updates. If updates are not required because of network conditions, bandwidth is preserved. Provide a basic level of security for network access. ACLs can allow . | Chapter 08 ACCESS CONTROL LIST MẠNG MÁY TÍNH NÂNG CAO What are ACLs: ACCES CONTROL LIST ACL tell the router what types of packets to accept or deny. Acceptance and denial can be based on specified conditions. ACLs enable management of traffic and secure access to and from a network What are ACLs The router examines each packet to determine whether to forward or drop it, based on the conditions specified in the ACL What are ACLs ACLs can be created for all routed network protocols, such as Internet Protocol (IP) and Internetwork Packet Exchange (IPX). ACLs must be defined on a per-protocol, per direction, or per port basis The Primary Reasons to Create ACLs Limit network traffic and increase network performance. For example By restricting video traffic Provide traffic flow control. ACLs can restrict the delivery of routing updates. If updates are not required because of network conditions, bandwidth is preserved. Provide a basic level of security for network access. ACLs can allow one host to access a part of the network and prevent another host from accessing the same area. For example, Host A is allowed to access the Human Resources network and Host B is prevented from accessing it. The Primary Reasons to Create ACLs Decide which types of traffic are forwarded or blocked at the router interfaces. For Examples: Permit e-mail traffic to be routed, but block all telnet traffic. Allow an administrator to control what areas a client can access on a network. Screen certain hosts to either allow or deny access to part of a network. Grant or deny user permission to access only certain types of files, such as FTP or HTTP How ACLs work How ACLs Work? ACLs define the set of rules that give added control for packets that enter inbound interfaces, packets that relay through the router, and packets that exit outbound interfaces of the router. ACLs do not act on packets that originate from the router itself. ACLs are configured either to apply to inbound traffic or to apply to

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