Quiz for Networking

Which one is not the advantage of packet switching comparing with circuit switching?

• No connection required

• Low latency

• High line utilization

• Can communicate with multiple targets at the same time

The process of packet switching does not include

• Dividing data into packets

• Adding extra information

• Waiting for the communication set-up

• Choosing optimal routes to transmit

Which one is an IPv4?

• 0E:34:5F:4A:7D:12

• 0.0.0.0

• 123.23.345.1

• 192.168.0.1.1

Which one is correct?

• The public IP is not unique in the Internet

• Two devices may have the same private IP

• Public IP is not required when you visit the Internet

• All networking devices have an IP address even if they are not online.

A subnet mask is 255.255.0.0, which means the corresponding IPv4 has _ bits network address.

• 24

• 16

• 8

• 0

Which one is not correct about DNS

• DNS refers to Domain Name System

• baidu.com is a Domain Name

• Domain Name has different levels

• Domain Name and Url are the same address

Which one is correct about DNS?

• Domain Name can be used to visit a website by DNS resolver directly.

• In a recursive query, DNS resolver needs to visit the root server.

• The iterative query is a process in which a DNS resolver queries a chain of one or more DNS servers

• My DNS resolver can't be changed by myself

Which one is the unit of bandwidth?

• bit

• bit/s

• B/s

• M

What is the firewall in computer network?

• A computer network operating system

• The boundary of network

• A system designed to prevent unauthorised access

• A browser

Which one is incorrect about VPN?

• All VPNs are illegal in China

• A VPN connection establishes a secure connection between you and the internet

• All your data traffic is routed through an encrypted virtual tunnel

• A VPN connection is also secure against external attacks