OSI Layers and DNS Records

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Last updated 1:31 AM on 7/28/26
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46 Terms

1
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What is OSI Layer 7?

Application

2
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What is OSI Layer 6?

Presentation

3
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What is OSI Layer 5?

Session

4
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What is OSI Layer 4?

Transport

5
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What is OSI Layer 3?

Network

6
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What is OSI Layer 2?

Data Link

7
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What is OSI Layer 1?

Physical

8
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Which OSI layer handles encryption?

Layer 6 (Presentation)

9
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Which OSI layer handles data compression?

Layer 6 (Presentation)

10
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Which OSI layer translates character sets such as ASCII and UTF-8?

Layer 6 (Presentation)

11
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Which OSI layer establishes, manages, and terminates sessions?

Layer 5 (Session)

12
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Which OSI layer uses TCP and UDP?

Layer 4 (Transport)

13
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Which OSI layer uses port numbers?

Layer 4 (Transport)

14
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Which OSI layer performs segmentation?

Layer 4 (Transport)

15
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Which OSI layer performs routing?

Layer 3 (Network)

16
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Which OSI layer uses IP addresses?

Layer 3 (Network)

17
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Which OSI layer uses packets?

Layer 3 (Network)

18
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Which OSI layer uses MAC addresses?

Layer 2 (Data Link)

19
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Which OSI layer uses frames?

Layer 2 (Data Link)

20
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Which OSI layer contains switches?

Layer 2 (Data Link)

21
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Which OSI layer contains bridges?

Layer 2 (Data Link)

22
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Which OSI layer transmits bits?

Layer 1 (Physical)

23
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Which OSI layer contains hubs?

Layer 1 (Physical)

24
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Which OSI layer contains repeaters?

Layer 1 (Physical)

25
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What is the PDU at Layers 5 through 7?

Data

26
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What is the PDU at Layer 4?

Segment

27
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What is the PDU at Layer 3?

Packet

28
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What is the PDU at Layer 2?

Frame

29
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What is the PDU at Layer 1?

Bits

30
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Which device primarily operates at Layer 3?

Router

31
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Which device primarily operates at Layer 2?

Switch

32
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Which device primarily operates at Layer 1?

Hub

33
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Which OSI layer is closest to the user?

Layer 7 (Application)

34
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Which OSI layer is closest to the physical network media?

Layer 1 (Physical)

35
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What does an A record do?

Maps a hostname to an IPv4 address

36
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What does an AAAA record do?

Maps a hostname to an IPv6 address

37
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What does a CNAME record do?

Creates an alias to another hostname

38
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What does a PTR record do?

Performs a reverse DNS lookup from an IP address to a hostname

39
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What does an MX record do?

Identifies the mail server for a domain

40
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What does an NS record do?

Identifies the authoritative name server for a domain

41
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Which DNS record is used for reverse lookups?

PTR

42
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Which DNS record is used as an alias?

CNAME

43
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Which DNS record points to an IPv4 address?

A

44
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Which DNS record points to an IPv6 address?

AAAA

45
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Which DNS record tells email where to go?

MX

46
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Which DNS record identifies a domain's name server?

NS