![vce designer drag and drop vce designer drag and drop](https://allautosales.ca/wp-content/uploads/2021/03/2.jpg)
Although the authentication is only one-way, you can negotiate CHAP in both directions, with the help of the same secret set for mutual authentication.įor more information about CHAP challenge please read our PPP tutorial.ĪAA offers different solutions that provide access control to network devices. This authentication method depends on a “secret” known only to the authenticator and the peer. If the values match, the authentication is successful.
![vce designer drag and drop vce designer drag and drop](https://mygreexampreparation.com/wp-content/uploads/2018/06/Gre-practice-test.jpg)
These are the general steps performed in CHAP:ġ) After the LCP (Link Control Protocol) phase is complete, and CHAP is negotiated between both devices, the authenticator sends a challenge message to the peer.Ģ) The peer responds with a value calculated through a one-way hash function (Message Digest 5 (MD5)).ģ) The authenticator checks the response against its own calculation of the expected hash value. The Challenge Handshake Authentication Protocol (CHAP) verifies the identity of the peer by means of a three-way handshake. + Established: Routers have a BGP peering session. + OpenConfirm: Router has received a reply to the open message. + OpenSent: An open message was sent to try to establish the peering. If the ConnectRetry timer expires then it will move back to the Connect state. If it is successful, it will move to the OpenSent state. + Active: BGP tries another TCP handshake to establish a connection with the remote BGP neighbor. Idle (admin) means that the neighbor relationship has been administratively shut down. + Idle: No peering router is looking for neighbor. The order of the BGP states is: Idle -> Connect -> (Active) -> OpenSent -> OpenConfirm -> Established So NAT64 “modifies session during translation”. NAT64 translates nearly everything (source & destination IP addresses, port number, IPv4/IPv6 headers… which is called a session) from IPv4 to IPv6 and vice versa. NAT64 is not as simple as IPv4 NAT which only translates source or destination IPv4 address. When a NAT64 router receives a packet which starts with NAT64 prefix, it will proceed this packet with NAT64. NAT64 prefix can be a Network-specific prefix (NSP), which is configured by a network administrator, or a well-known prefix (which is 64:FF9B::/96). NAT64 requires a dedicated prefix, called NAT64 prefix, to recognize which hosts need IPv4-IPv6 translation. NAT64 provides communication between IPv6 and IPv4 hosts by using a form of network address translation (NAT).