Terminologija koja se susreće prilikom ulaska u računalni svijet može se činiti čudnim ili vam ponekad zbuniti, pitajući se kako i zašto su ti pojmovi u upotrebi. Imajući to na umu, današnji SuperUser Q & A post ima odgovore na pitanja zbunjenog čitatelja.
Današnja pitanja i odgovori nam se javljaju zahvaljujući SuperUseru - podjele Stack Exchange-a, zajednice-driven grupiranja Q & A web stranica.
Pitanje
SuperUser čitač user7681202 želi znati zašto se mrežni tunel zove "tunel":
I do not understand why the “tunnel” metaphor is used to describe a networking tunnel.
At first, I thought the reason was because the data was sent in an encrypted form so that an eavesdropper would not be able to see the data (seeing the data wrapped in a tunnel instead).
But what of the tunneling protocols that do not use encryption? Why are they also called “tunnels”?
Zašto je mrežni tunel zvan "tunel"?
Odgovor
Za nas su odgovorili korisnici SuperUser-a, Mokubai i DavidPostill. Prvo, Mokubai:
In the case of roads, a real world tunnel is a constructed passage that allows you to pass directly from point A to point B instead of taking a route that is longer and/or has more things to slow you down. Examples include tunnels through mountains that you might otherwise have to go around, underpasses that let you get to the other side of the road without walking across it, and subway tunnels that let trains move around a city without the need to contend with roads and buildings.
In each of these cases, a tunnel provides a direct path that avoids some type of complexity you would otherwise have to deal with. In networking, it is used in the same way.
An IPv4 over IPv6 tunnel allows IPv4 to pass through an IPv6 network into another IPv4 network, something that would otherwise not be possible without the originating computer understanding the IPv6 network.
A VPN is a tunnel specifically intended for connecting two private networks without the overhead of translating the IP addresses between private and public addresses at each end.
An example that combines the two is game VPN software like Hamachi that could be used to play “over the Internet” games which used old protocols like IPX or relied on local discovery to find other players.
Slijedi odgovor DavidPostilla:
Why is a network tunnel called a “tunnel”?
The phrase was first used (as far as I can tell) in the RFC 1075 Distance Vector Multicast Routing Protocol, where it is defined as follows:
And…Although the above states, “We consider tunnels to be a transitional hack.”, tunneling is still used today with essentially the same meaning. The data sent through a tunnel is encapsulated so that it can be transmitted via a protocol that would otherwise not support the transmission:Image
Source: Networking 101 – Understanding Tunneling
Imate li nešto za objašnjenje? Zvuči u komentarima. Želite li pročitati više odgovora od drugih tehnoloških korisnika Stack Exchangea? Pogledajte ovdje cijelu raspravu.
Objesujte se oko ureda dovoljno dugo i vidjet ćete jasan trend u mrežnim kablovima. Neki kabeli imaju pokriveni utikač, a neki kabeli su goli. Što je svrha malog poklopca?
Svi znamo da je važno izraditi sigurnosnu kopiju Mac računala pomoću Time Machinea, no sjećanje na priključivanje vanjskog diska može biti gnjavaža, pogotovo ako ste korisnik MacBook računala. Tako mrežne sigurnosne kopije dolaze u uporabu: ne morate se sjetiti da ništa poduzmete.
Nintendo ima vrtoglav niz različitih online računa povezanih s raznim uslugama. Ako postavljate novi preklopnik, evo što trebate znati i kako zatražiti jedinstveni ID računa za Nintendo.
Čak i uz napredak Wi-Fi usmjerivača, još uvijek možete imati mrtvu točku ili dvije u svojoj kući (a ako imate stariji usmjerivač, vjerojatno imate čitav dio svog doma sa slabim ili nepostojećim signalom). D-Link DAP-1250 nudi mrtvu jednostavnu i niskobudžetnu priliku za proširenje dosega vaše kućne mreže.
Windows 10 uključuje Windows Defender, koji štiti vaše računalo od virusa i drugih prijetnji. Proces "Usluga inspekcije u stvarnom vremenu Microsoftove mreže", također poznat kao NisSrv.exe, dio je Microsoftovog protuvirusnog softvera.
