CS6250 Computer Networks Exam 1
Questions and Answers (Verified
Answers) ||ACTUAL EXAM 2026 TEST!!
Graded A+|| NEWEST
What are advantages and disadvantages of a layered architecture? -
CORRECTANSWER Each protocol layer offers different services.
Layered Architecture -CORRECTANSWER Each protocol layer offers different services.
Layered Architecture Advantages -CORRECTANSWER - Scalability,
- Flexibility
- Ease of adding / removing components making it easier for cost-effective
implementations.
Layered Architecture Disadvantages -CORRECTANSWER - Some layers functionality
depends on the information from the other layer and violates the goal of layer
separation;
- One layer may duplicate lower layer functionalities
- Overhead both in computation
- Overhead in message headers caused by abstraction barriers between layers.
,OSI and Five-Layered Internet model Similarities -CORRECTANSWER Many of the
layers are the same
OSI and Five-Layered Internet model Differences -CORRECTANSWER - Three of the
layers are combined in the 5-layered model.
- Specifically the five-layer model combines the
- Application
- Presentation
- Session layers
from the OSI model into a single Application layer.
What are sockets? -CORRECTANSWER - A network socket is a software structure
within a network node of a computer network that serves as an endpoint for sending
and receiving data across the network.
- The structure and properties of a socket are defined by an application programming
interface (API) for the networking architecture.
- Sockets are created only during the lifetime of a process of an application running in
the node.
- ."A process sends messages into, and receives messages from, the network through a
software interface called a socket.
- Let's consider an analogy to help us understand processes and sockets. A process is
analogous to a house and its socket is analogous to its door....a socket is the interface
,between the application layer and the transport layer within a host." - Kurose and Ross,
2.1
Describe each layer of the OSI model. -CORRECTANSWER - Application layer:
Service, Interface, Protocol.
- Presentation layer: Plays intermediate role of formatting the information received from
the layer below and delivering it to the application layer.
- Session layer: Responsible for the mechanism that manages the different transport
streams that belong to the same session between end-user and application process.
- Transport layer: Responsible for the end-to-end communication between end hosts.
Network layer: This layer is responsible for moving the packet of information, called a
datagram, from one host to another.
- Data Link layer: Responsible for moving the frames from one node (host or router) to
the next node.
- Physical layer: This layer is the actual hardware responsible to transfer bits within a
frame between two nodes c
, OSI Model Application Layer -CORRECTANSWER - Service, Interface, Protocol.
Ex: Turn on your smartphone and look at the list of apps. (HTTP, SMTP, FTP, DNS)
OSI Model Presentation Layer -CORRECTANSWER - Plays intermediate role of
formatting the information received from the layer below and delivering it to the
application layer.
Ex: converting big endian to little endian.
OSI Model Session Layer -CORRECTANSWER - Responsible for the mechanism that
manages the different transport streams that belong to the same session between end-
user and application process.
Ex: teleconference app, it is responsible for tying together audio and video streaming.
OSI Model Network Layer -CORRECTANSWER - This layer is responsible for moving
the packet of information, called a datagram, from one host to another.
- Responsible for delivering the datagram to the Transport layer on the destination host.
- In this layer there are the IP Protocol and the routing tables.
Questions and Answers (Verified
Answers) ||ACTUAL EXAM 2026 TEST!!
Graded A+|| NEWEST
What are advantages and disadvantages of a layered architecture? -
CORRECTANSWER Each protocol layer offers different services.
Layered Architecture -CORRECTANSWER Each protocol layer offers different services.
Layered Architecture Advantages -CORRECTANSWER - Scalability,
- Flexibility
- Ease of adding / removing components making it easier for cost-effective
implementations.
Layered Architecture Disadvantages -CORRECTANSWER - Some layers functionality
depends on the information from the other layer and violates the goal of layer
separation;
- One layer may duplicate lower layer functionalities
- Overhead both in computation
- Overhead in message headers caused by abstraction barriers between layers.
,OSI and Five-Layered Internet model Similarities -CORRECTANSWER Many of the
layers are the same
OSI and Five-Layered Internet model Differences -CORRECTANSWER - Three of the
layers are combined in the 5-layered model.
- Specifically the five-layer model combines the
- Application
- Presentation
- Session layers
from the OSI model into a single Application layer.
What are sockets? -CORRECTANSWER - A network socket is a software structure
within a network node of a computer network that serves as an endpoint for sending
and receiving data across the network.
- The structure and properties of a socket are defined by an application programming
interface (API) for the networking architecture.
- Sockets are created only during the lifetime of a process of an application running in
the node.
- ."A process sends messages into, and receives messages from, the network through a
software interface called a socket.
- Let's consider an analogy to help us understand processes and sockets. A process is
analogous to a house and its socket is analogous to its door....a socket is the interface
,between the application layer and the transport layer within a host." - Kurose and Ross,
2.1
Describe each layer of the OSI model. -CORRECTANSWER - Application layer:
Service, Interface, Protocol.
- Presentation layer: Plays intermediate role of formatting the information received from
the layer below and delivering it to the application layer.
- Session layer: Responsible for the mechanism that manages the different transport
streams that belong to the same session between end-user and application process.
- Transport layer: Responsible for the end-to-end communication between end hosts.
Network layer: This layer is responsible for moving the packet of information, called a
datagram, from one host to another.
- Data Link layer: Responsible for moving the frames from one node (host or router) to
the next node.
- Physical layer: This layer is the actual hardware responsible to transfer bits within a
frame between two nodes c
, OSI Model Application Layer -CORRECTANSWER - Service, Interface, Protocol.
Ex: Turn on your smartphone and look at the list of apps. (HTTP, SMTP, FTP, DNS)
OSI Model Presentation Layer -CORRECTANSWER - Plays intermediate role of
formatting the information received from the layer below and delivering it to the
application layer.
Ex: converting big endian to little endian.
OSI Model Session Layer -CORRECTANSWER - Responsible for the mechanism that
manages the different transport streams that belong to the same session between end-
user and application process.
Ex: teleconference app, it is responsible for tying together audio and video streaming.
OSI Model Network Layer -CORRECTANSWER - This layer is responsible for moving
the packet of information, called a datagram, from one host to another.
- Responsible for delivering the datagram to the Transport layer on the destination host.
- In this layer there are the IP Protocol and the routing tables.
