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What is line protocol is administratively down on a cisco router?
The message is something like "Serial 0/0 is up, line protocol is down". The first part refers to the physical connection (layer 1 of the OSI model), which works in this case; the second part refers to layer 2 of the OSI model (the serial networking protocol, like HDLC or PPP), which in this example doesn't work for some reason.
What is Logical Link Control Protocols?
It is forms part of the Point-to-Point Protocol. In setting up PPP communications, both the sending and receiving devices send out LCP packets to determine the standards of the ensuing data transmission. LCP is logically a Transport Layer protocol according to the OSI model,
What is the purpose of the Logic Link Control protocol?
It is forms part of the Point-to-Point Protocol. In setting up PPP communications, both the sending and receiving devices send out LCP packets to determine the standards of the ensuing data transmission. LCP is logically a Transport Layer protocol according to the OSI model,
Which protocols operate at the data link layer?
The data link layer, which is the second layer of the OSI model, includes protocols such as Ethernet, Point-to-Point Protocol (PPP), and High-Level Data Link Control (HDLC). Ethernet is widely used for local area networks (LANs), while PPP is commonly used for direct connections between two network nodes. Additionally, protocols like Wi-Fi (IEEE 802.11) also operate at this layer, facilitating wireless communication. These protocols handle framing, addressing, and error detection for data transmitted over physical media.
Is DSL a WAN data link encapsulation?
Frame relay and PPP is used with WAN encapsulation. Frame Relay most closely compares to the OSI data link layer (Layer 2). If you remember that the word "frame" describes the data link layer protocol data unit (PDU), it will be easy to remember that Frame Relay relates to OSI Layer 2. Like other data-link protocols, Frame Relay can be used to deliver packets (Layer 3 PDUs) between routers.
What does PPP use to encapsulate multiple network-layer protocols?
Network control protocol
Which functions are provided by lcp and ncp as part of the ppp layered architecture?
LCP sets up the PPP connection and its parameters. NCP handles higher layer protocol configurations.
What protocol does PPP use to identify the Network layer protocol?
Network Control Protocol is uses to identify the Network layer protocol used in the packet
4 basic function of datalink layer?
error control and recovery flow control ppp(point to point protocol transfering from physical layer to network entities
What function does NCP perform in the establishment of a PPP session?
NCP (Network Control Protocol) is responsible for negotiating and configuring the network-layer parameters of a PPP (Point-to-Point Protocol) session. It establishes and manages the network control options needed for the successful communication between the two endpoints of the PPP link. NCP allows for the customization of network protocols and parameters to suit the specific requirements of the PPP connection.
Line protocol in down then what you do?
there may be the issue with the layer 2 protocol like hdlc or ppp is not configured or wrongly configured if the interface is serial interface.
Which combination of authentication and Layer 2 protocol should be used to establish a link between a Cisco and a non-Cisco router without sending authentication information in plain text?
pp chap
