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Open top bus – Bus, usually a double-decker bus, without a roof . City Sightseeing operates a service by this name in many cities; Tour bus service – Sightseeing bus service for tourists
Many tours also have a live guide. Tourists may board and leave the buses within their ticket's time limit at the different bus stops on the circular routes. This is called hop-on-hop-off. Many cities have more than one route to showcase all the different sights and attractions. On some routes, buses leave the city for suburban sights.
Time to live (TTL) or hop limit is a mechanism which limits the lifespan or lifetime of data in a computer or network. TTL may be implemented as a counter or timestamp attached to or embedded in the data. Once the prescribed event count or timespan has elapsed, data is discarded or revalidated.
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Thus, hop count is a rough measure of distance between two hosts. For a routing protocol using 1-origin hop counts [1] (such as RIP), a hop count of n means that n networks separate the source host from the destination host. [1] [2] Other protocols such as DHCP use the term "hop" to refer to the number of times a message has been forwarded. [3]
With hop-by-hop transport, chunks of data are forwarded from node to node in a store-and-forward manner. As hop-by-hop transport involves not only the source and destination node, but rather some or all of the intermediate nodes as well, it allows data to be forwarded even if the path between source and destination is not permanently connected ...
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The sign-off sequence may include some or all of the following stages, but not necessarily in this order: An announcement informing viewers that the station is about to go off-air: it may also include a message of thanks for the viewer's patronage, along with an announcement of the time when the station is scheduled to sign on again.