Computer networks worksheet with answers

Which type of cable carries data as pulses of light?

1. AShielded copper cable
2. BTwisted-pair cable
3. CCoaxial cable
4. DFibre-optic cable

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

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

Which IEEE standard family defines wired Ethernet?

1. AIEEE 802.5
2. BIEEE 802.11
3. CIEEE 802.16
4. DIEEE 802.3

Why does Wi-Fi use collision avoidance (CSMA/CA) instead of collision detection?

1. AWi-Fi only allows one device per network
2. BCollision detection only works on fibre cables, not on shared wireless radio channels
3. CRadio signals never collide
4. DA wireless station cannot reliably detect collisions while it is transmitting

TLS provides which security properties for HTTPS?

1. AProtection against all malware and phishing on the visited site
2. BConfidentiality, integrity and server authentication
3. COnly faster loading
4. DAnonymity of the user

Using even parity, which parity bit is added to the data bits 1011001?

1. A2
2. B4
3. C0
4. D1

The count-to-infinity problem occurs in which kind of routing protocol, and what helps against it?

1. ADistance-vector; split horizon and poison reverse
2. BStatic routing; adding default routes
3. CPath-vector; longer AS paths
4. DLink-state; flooding link updates

Why does IPv6 not need NAT for address shortage?

1. AIts 128-bit address space is large enough to give every device a global address
2. BIPv6 only works on local networks, so addresses never need to be shared globally
3. CIPv6 does not use addresses
4. DIPv6 encrypts all addresses