Which IS-IS packet is used to determine the level of an IS-IS neighbor?
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A. B. C. D.A
The correct answer is A. IIH (IS-IS Hello) packet is used to determine the level of an IS-IS neighbor.
IS-IS (Intermediate System to Intermediate System) is a link-state routing protocol used for routing data between network devices, such as routers. The protocol uses a hierarchy of areas, levels, and domains to facilitate efficient routing. In IS-IS, each device has a level assigned to it, which indicates the device's location in the hierarchy.
IS-IS uses three packet types to communicate with its neighbors: Hello (IIH), Link State Packet (LSP), and Partial Sequence Number Packet (PSNP).
The Hello packet is used for neighbor discovery and to establish and maintain adjacency between devices. The Hello packet includes information about the device's level, so when a device receives a Hello packet from a neighbor, it can determine the neighbor's level.
The LSP packet contains information about the state of the device's links and the network topology. LSPs are flooded throughout the network to ensure that all devices have the same information about the network.
The PSNP packet is used to synchronize the LSP database between two devices. When a device receives a PSNP packet from a neighbor, it compares the list of LSPs in the PSNP packet to its own database to determine which LSPs it needs to request from the neighbor.
The CSNP packet is used to summarize the LSP database and to request missing LSPs from neighbors.
In summary, the IIH (Hello) packet is used to determine the level of an IS-IS neighbor. The LSP packet contains information about the network topology, the PSNP packet is used to synchronize the LSP database between devices, and the CSNP packet is used to summarize the LSP database and request missing LSPs from neighbors.