Consider a scenario where a web server responds to a client request. Trace the data flow: which layer encapsulates the HTTP response into segments before transmission?
AApplication Layer adds HTTP headers
BTransport Layer encapsulates into segments/datagrams
CNetwork Layer adds IP headers
DData Link Layer frames the data
Correct Answer:
B. Transport Layer encapsulates into segments/datagrams
Explanation:
The HTTP response originates at Layer 7 (Application), but the Transport Layer (Layer 4) encapsulates it into TCP segments or UDP datagrams. This is the proper encapsulation step at Layer 4.
In the context of the OSI model, which layer is responsible for ensuring reliable, in-order delivery of data?
ASession Layer
BTransport Layer
CData Link Layer
DNetwork Layer
Correct Answer:
B. Transport Layer
Explanation:
The Transport Layer (Layer 4) provides reliable, in-order delivery through TCP. UDP at this layer provides unreliable delivery. Reliability mechanisms like sequence numbers and acknowledgments operate here.
Which protocol operates at the Data Link Layer and is primarily used in Ethernet networks?
AIP (Internet Protocol)
BTCP (Transmission Control Protocol)
CMAC (Media Access Control) / 802.3
DDNS (Domain Name System)
Correct Answer:
C. MAC (Media Access Control) / 802.3
Explanation:
MAC and 802.3 standards operate at the Data Link Layer (Layer 2). They define how devices access and share Ethernet transmission media using MAC addresses.
A network administrator needs to implement a solution that translates character encoding formats between different systems. Which OSI layer provides this functionality?
ASession Layer
BPresentation Layer
CApplication Layer
DTransport Layer
Correct Answer:
B. Presentation Layer
Explanation:
The Presentation Layer (Layer 6) handles data translation, character encoding/decoding, encryption, and data format conversions. It ensures data from the sender is in a format the receiver can understand.
