Computer networks worksheet with answers

Which device simply repeats every incoming signal out of all its other ports?

1. AA switch
2. BA router
3. CA firewall
4. DA hub

Which protocol is used to send email between mail servers?

1. ASNMP
2. BPOP3
3. CIMAP
4. DSMTP

In the URL https://www.example.com/index.html, which part is the host name?

1. Ahttps
2. Bindex.html
3. Cwww.example.com
4. Dexample.com/index.html

Why does a switch sometimes send a frame out of all ports except the one it came in on?

1. AThe frame has a wrong IP checksum and must be checked by every host
2. BThe destination MAC address is not yet in its address table
3. CThe frame is too large for one port
4. DThe switch is acting as a router

What is the main difference between the HTTP methods GET and POST?

1. AGET uses UDP, POST uses TCP
2. BGET deletes a resource, POST reads it from the server's database
3. CGET retrieves a resource, POST submits data in the request body
4. DGET is encrypted, POST is not

What is the purpose of the TCP three-way handshake?

1. ATo establish a connection and synchronise sequence numbers
2. BTo find the IP address of a host before data can be sent to it
3. CTo close a connection quickly
4. DTo encrypt the data

Why was the TCP window scale option introduced?

1. AThe 32-bit window field was too large and wasted header space in every TCP segment sent
2. BUDP needed a way to control its sending rate on congested paths
3. CWithout it, TCP could not detect lost segments on long-distance links
4. DThe 16-bit window field limits the window to 65,535 bytes, too small for fast long-distance paths

What does BGP mainly do on the internet?

1. AAssigns IP addresses to home users through their internet providers
2. BEncrypts data between routers
3. CExchanges routing information between autonomous systems
4. DResolves names to addresses