Computer networks worksheet with answers

Which IEEE standard family defines wired Ethernet?

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

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

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

What is the main job of a firewall?

1. ATo allow or block traffic according to security rules
2. BTo speed up downloads by caching files
3. CTo convert domain names into addresses
4. DTo assign IP addresses to hosts

What does ARP do?

1. AAssigns IP addresses automatically to hosts when they join the local network
2. BResolves domain names
3. CFinds the MAC address that belongs to an IP address on the local network
4. DRoutes packets on the internet

NAT (network address translation) is mainly used to:

1. AIncrease the speed of a network cable
2. BTranslate domain names into IP addresses for devices on a local network
3. CEncrypt traffic between two sites
4. DLet many devices with private addresses share one public IP address

How does TLS typically use asymmetric and symmetric cryptography?

1. AAsymmetric methods agree keys and authenticate; symmetric ciphers encrypt the data
2. BSymmetric methods agree keys and authenticate; asymmetric ciphers encrypt all the data
3. COnly asymmetric cryptography is used throughout
4. DOnly symmetric cryptography is used, with a fixed shared password

An attacker on a LAN sends forged ARP replies claiming the gateway's IP address. What is the likely result?

1. AThe gateway's IP address is permanently changed to the attacker's address on every router
2. BThe switch shuts down all of its ports
3. CVictims send traffic for the gateway to the attacker, enabling a man-in-the-middle attack
4. DAll DNS queries fail across the internet

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