With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Mexico City is where the principal photography of Vantage Point (film) began.
text_B: In computer communication theory relating to packet-switched networks , a distance-vector routing protocol is one of the two major classes of intra domain routing protocols , the other major class being the link-state protocol .. computer communication. computer communication. routing protocol. routing protocol. link-state protocol. link-state routing protocol. Distance-vector routing protocols use the Bellman -- Ford algorithm , Ford -- Fulkerson algorithm , or DUAL FSM -LRB- in the case of Cisco Systems 's protocols -RRB- to calculate paths .. DUAL FSM. DUAL FSM. Cisco Systems. Cisco Systems. A distance-vector routing protocol requires that a router inform its neighbors of topology changes periodically .. routing protocol. routing protocol. Compared to link-state protocols , which require a router to inform all the nodes in a network of topology changes , distance-vector routing protocols have less computational complexity and message overhead .. computational complexity. Analysis of algorithms. message overhead. Protocol overhead. The term distance vector refers to the fact that the protocol manipulates vectors -LRB- arrays -RRB- of distances to other nodes in the network .. arrays. Array data structure. The distance vector algorithm was the original ARPANET routing algorithm and was also used in the Internet under the name of RIP -LRB- Routing Information Protocol -RRB- .. ARPANET. ARPANET. Examples of distance-vector routing protocols include RIPv1 and RIPv2 , IGRP and Babel .. RIPv1 and RIPv2. Routing Information Protocol. IGRP. Interior Gateway Routing Protocol. Babel. Babel ( protocol )
not_related.