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Objective 2.7220-1201

2.7 Compare and contrast internet connection types, network types, and their characteristics.

Objective 2.7 sits in Networking, which carries 23% of the A+ Core 1 exam. The questions below are original, written from the official objective title above, and each explanation cites the CompTIA page it rests on.

Objective title verbatim from the official objectives. CompTIA exam page ↗

A worked example

Shown solved, with the whole explanation open: this is what every question here carries.

NetworkingEasy

A technician configures a resolver on a workstation connected to a company's wide area network (WAN) that spans several branch offices. Before the resolver can process a user's request for a hostname, what must it already possess?

Correct.

The concept

A resolver's starting point in domain name resolution is a known name server, not a preloaded copy of the whole namespace or the answer it is trying to find.

Why this answer

The resolver begins with knowledge of at least one name server and uses referrals from that server to locate the data it needs.

  • ACaching improves performance on repeated lookups but is not a prerequisite the resolver must hold before starting a query.
  • BA MAC address belongs to link-layer addressing and plays no role in how a resolver begins a name lookup.
  • Correct: the resolver only needs to know at least one name server to begin processing the query.
  • DResolvers reach other servers through referrals rather than requiring a direct link to the root of the domain space.
  • EThe destination host's IP address is the result the resolver is trying to obtain, not something it starts with.
Read the sourceRFC 1035: Domain Names
Source-cited
dnswanname-resolutionnetwork-types

Now you: objective 2.7 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

NetworkingModerate

A technician troubleshoots connectivity between two offices linked by a WAN circuit. A packet capture on the source shows the TCP SYN packet retransmitted three times with no response, while the destination's capture shows no SYN packets received at all. What does this indicate?

Sample question 2 of 3

NetworkingModerate

On a local area network (LAN), a file server closes hundreds of client sessions each afternoon. A network capture shows the FIN flag set to 1 in both directions before each session ends. What type of session closure is occurring?

Sample question 3 of 3

NetworkingHard

A branch office's link to the WAN fails, cutting it off from the company's primary DNS name server. Users at that branch can still resolve hostnames for the domain. Per the domain name system's design, what most likely allows this?

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

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