Which ONE of the following statements is true of loop detection in BGP (Border Gateway Protocol).The underlying algorithm used (a modification of Bellman-Ford) guarantees a loop-free solution.Because BGP uses policies that might not select the shortest path, loops must be identified and pruned during path selection. To fix this routers will scan the AS_PATH looking for their own AS, and reject any routes that include themselves.BGP does not guarantee loop-free routing, which is why the TTL/HopCount field must be included in the IP header.

Given: Which ONE of the following statements is true of loop detection in BGP (Border Gateway Protocol). The underlying algorithm used (a modification of Bellman-Ford) guarantees a loop-free solution. Because BGP uses policies that might not select the shortest path, loops must be identified and pruned during path selection. To fix this routers will scan the AS_PATH looking for their own AS, and reject any routes that include themselves. BGP does not guarantee loop-free routing, which is why the TTL/HopCount field must be included in the IP header.Answer: BGP: The Border Gateway Protocol (BGP) BGP is a routing protocol for inter-autonomous systems.An autonomous system (AS) is a network or collection of networks that share management and routing principles. BGP is the protocol used by Internet service providers (ISP) that are distinct ASes to exchange routing information for the Internet.Statement 1,2 are true and 3 is false Explanation: The distributed BF method requires nodes to share routing vectors representing shortest path distances computed using the BF iteration. Each element in a routing vector is a message that contains a destination node and the distance from the node transmitting the vector to that destination. When a node gets a routing vector from a nearby node, it updates its distances to other nodes through this neighbor, and any changes to the routing table are then broadcast to all neighbors. Let Di = [D$ signify the distance matrix stored in node I with entry Db denoting the distance between I and j via i's neighbor k. The routing table is a DJ-derived array with one item for each destination. Each item is a triplet that specifies the destination (say j), the preferred neighbor Pij (the neighbor along the shortest path Rij to the destination), and the current shortest distance (the minimum of row j in Di), represented by RDIST (j). The BF method finds the shortest distance between all linked pairs of nodes. A node's lower level (link) protocol presents the notice link failure/recovery and weight changes. When the link weight of link (i,k) changes, the response is as if a (N-l)-entry vector is received on the link (i,k), with each entry corresponding to (k, Di - d;) for every j (d; is the former link weight of link (i,k). A BGP speaking system's principal role is to share network reachability information with other BGP systems. This network reachability data comprises information on the Autonomous Systems (ASs) that the reachability data traverses. Based on the information shared between BGP routers, BGP creates a graph of autonomous systems. In terms of BGP, the whole Internet is a graph of ASs, with each AS designated by a unique AS number. Connections between two ASs establish a path, and the collection of path data forms a route to a given destination. BGP makes use of route information to guarantee that inter-domain routing is not looped. Because BGP does not ensure loop-free routing, the TTL/HopCount field in the IP header is required.