第 1 题
1 分Which of the following statements accurately describes a key characteristic of circuit switching?
Cambridge International A Level · Computer Science (9618)
Communication and internet technologies：练习题
5 道选择题即时批改，另有 5 道文字题附完整解题步骤，全部围绕「Communication and internet technologies」。
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第 2 题
1 分When comparing email protocols, what is a primary advantage of using IMAP (Internet Message Access Protocol) over POP3 (Post Office Protocol 3)?
第 3 题
1 分During a Domain Name Service (DNS) resolution, what is the next step if the local DNS server does not find the IP address for a requested domain in its cache?
第 4 题
1 分How many bits are used to represent a single IPv4 address?
第 5 题
1 分What is the primary function of the CSMA/CD protocol within an Ethernet network?
第 6 题
2 分State the primary purpose of the Simple Mail Transfer Protocol (SMTP) in internet communications.
先自己写一遍答案，再对照解题步骤。
第 7 题
4 分Identify the difference between a Public IP address and a Private IP address, and explain one reason why a network might use NAT (Network Address Translation).
先自己写一遍答案，再对照解题步骤。
第 8 题
4 分Explain how a router uses a routing table and destination IP address to forward an incoming packet in a packet-switched network.
先自己写一遍答案，再对照解题步骤。
第 9 题
4 分Cloud computing is a model for providing ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources.
(a) Describe the primary differences between a public cloud and a private cloud.
(b) Explain two benefits for a small business that chooses to use cloud computing rather than maintaining its own physical servers.
先自己写一遍答案，再对照解题步骤。
第 10 题
4 分A user enters a Uniform Resource Locator (URL) into a web browser to access a specific website.
(a) Identify three distinct parts that make up a typical URL.
(b) Describe the role of the Domain Name Service (DNS) in the process of locating a resource on the World Wide Web when a URL is provided.
先自己写一遍答案，再对照解题步骤。
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