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Understanding the Seven Layers of the OSI network model

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sirhulk1
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Open Systems Interconnect (OSI) Model

Question 1 of 28

1

What best describes the Open Systems Interconnection model (OSI) ?

Select one or more of the following:

  • A physical model that contains seven layers and provides different vendors to communicate on the network.

  • Its a conceptual model that characterizes and standardizes the internal functions of the a communication system by partitioning it into abstraction layers.

Explanation

Question 2 of 28

1

What is layer 1: Physical layer ?

Select one or more of the following:

  • Provides the functional and procedural means to transfer data between network entities and to detect and possibly correct errors that may occur in the physical layer.

  • Provides the functional and procedural means of transferring variables length data sequences from a source host on one network to a destination host on a different network.

  • Defines the electrical and physical specifications for devices.

Explanation

Question 3 of 28

1

What best describes the Data Link Layer?

Select one of the following:

  • Provides the functional and procedural means of transferring variables length data sequences from a source host on one network to a destination host on a different network. It routes packets through logical addressing.

  • Defines the electrical and physical specifications for devices.

  • Defines how data is formatted for transmission and how access to the network is controlled. Provides error detection but no flow control using sliding window.

Explanation

Question 4 of 28

1

What best describes the Network Layer?

Select one of the following:

  • It segments and reassembles data in to a data stream. Services in this layer segment and reassembles data from upper layer applications.

  • Provides the physical transmission of data and handles error notification, network topology, and flow control.

  • Manages device addressing, tracks the locations of devices in the network and determines the best way to move data through logical addressing.

Explanation

Question 5 of 28

1

What best describes the Transport Layer?

Select one of the following:

  • Manages device addressing, tracks the locations of devices in the network and determines the best way to move data through logical addressing.

  • Provides the physical transmission of data and handles error notification, network topology, and flow control.

  • It segments and reassembles data in to a data stream. Services in this layer segment and reassembles data from upper layer applications.

Explanation

Question 6 of 28

1

What best describes the Session Layer?

Select one of the following:

  • Provides the physical transmission of data and handles error notification, network topology, and flow control.

  • Defines the electrical and physical specifications for devices.

  • Defined as a translator and provides coding and conversion functions. Presents data to the Application layer and is responsible for data translation and code formatting.

Explanation

Question 7 of 28

1

What best describes the Session Layer?

Select one of the following:

  • Manages device addressing, tracks the locations of devices in the network and determines the best way to move data through logical addressing.

  • Its responsible for setting up, managing and tearing down sessions between Presentation Layer entities.

  • It segments and reassembles data in to a data stream. Services in this layer segment and reassembles data from upper layer applications.

Explanation

Question 8 of 28

1

What are examples of the Physical Layer?

Select one of the following:

  • IPv4 and IPv6 used in logical addressing

  • Hubs and Repeaters. Also transmission media such as copper and fiber.

  • Hardware addressing, flow control and error notification.

Explanation

Question 9 of 28

1

What are examples of Data Link Layer?

Select one of the following:

  • Physical addressing, Network topology, Flow control and Error notification.

  • TCP and UDP

  • IPv4 and IPv6

  • FIle, print, messages, database and application services

Explanation

Question 10 of 28

1

What are examples of Network Layer?

Select one of the following:

  • Hubs and Repeaters

  • IPv4 and IPv6

  • TCP and UDP

Explanation

Question 11 of 28

1

What are examples of the Transport Layer? (Pick Two)

Select one or more of the following:

  • Routing using IPv4 and IPv6

  • Dialog control and sessions.

  • Establishes sessions and tearing down virtual circuit.

  • Data encryption, compression, and translation services.

  • UDP and TCP.

Explanation

Question 12 of 28

1

What are examples of the Session Layer? (Pick two)

Select one or more of the following:

  • Data encryption, compression, and translation services.

  • Physical topology

  • Keeps applications data separate from other applications data.

  • File, print, message and database.

  • dialog control, simplex mode, half duplex mode, and full duplex mode.

Explanation

Question 13 of 28

1

What are examples of the Application Layer? (Pick Two)

Select one or more of the following:

  • TCP and UDP

  • Physical Topologies

  • Telnet, HTTP, Email, SSH, DNS, FTP, SMTP and LDAP, and SNMP.

  • DHCP

Explanation

Question 14 of 28

1

The Data Link Layer provides _____________ transmission of data and handles ____________ notification.

Select one or more of the following:

  • 1) fast 2) network

  • 1) physical 2) error

  • 1) access control 2) error

Explanation

Question 15 of 28

1

What is the Media Access Control (MAC) IEEE 802.3 ?

Select one of the following:

  • It is a sublayer of the Data Link layer that is responsible for physical addressing. It defines how packets are placed on the media. Its called media access since it acts as a first come first service access.

  • It is a sublayer of the Data Link layer that is responsible for identifying network layer protocols and encapsulating them. Its header tells the data link layer what to do with the packet once a frame is received.

Explanation

Question 16 of 28

1

What is the Logical Link Control (LLC) IEEE 802.2 ?

Select one of the following:

  • It is a sublayer of the Data Link layer that is responsible for identifying network layer protocols and encapsulating them. Its header tells the data link layer what to do with the packet once a frame is received.

  • It is a sublayer of the Data Link layer that is responsible for physical addressing. It defines how packets are placed on the media. Its called media access since it acts as a first come first service access.

Explanation

Question 17 of 28

1

MAC address is a _____ bit ___________ address

Select one of the following:

  • 48 bit hexadecimal address

  • 64 bit hexadecimal address

  • 128 bit hexadecimal address

Explanation

Question 18 of 28

1

In a 48 bit MAC address, what represents the first 24 bits and what represents the remaining 24 bits?

Select one of the following:

  • The first 24 bits is the unique serial number and the second 24 bits represent the OUI

  • The first 24 bits is the customer number and the second 24 bits represent the unique serial number

  • The first 24 bits is the vendor (Organizational Unique Identifier) and the second 24 bits represent the unique serial number.

Explanation

Question 19 of 28

1

What is Ethernet?

Select one of the following:

  • Its a topology that allows network access for data transmission in the network

  • It is a contention media access method that allows all users on the network to share the same bandwidth.

Explanation

Question 20 of 28

1

Ethernet is a popular technology since its scalable as its easy to integrate new technologies. It uses both the data link layer and physical layer specifications.

Select one of the following:

  • True
  • False

Explanation

Question 21 of 28

1

What is a unicast?

Select one of the following:

  • It communicates with the LAN as a one to many hosts.

  • It communicates with the LAN as a one to one host.

  • it communicates with the LAN as a one to certain hosts

  • It communicates with the LAN as a one to nearest host

Explanation

Question 22 of 28

1

What is multicast?

Select one of the following:

  • It communicates with the LAN as a one to many hosts.

  • It communicates with the LAN as a one to one host.

  • it communicates with the LAN as a one to certain hosts

  • It communicates with the LAN as a one to nearest host

Explanation

Question 23 of 28

1

What is Broadcast?

Select one of the following:

  • It communicates with the LAN as a one to many hosts.

  • It communicates with the LAN as a one to one host.

  • it communicates with the LAN as a one to certain hosts

  • It communicates with the LAN as a one to nearest host

Explanation

Question 24 of 28

1

What is an anycast?

Select one of the following:

  • It communicates with the LAN as a one to one host.

  • It communicates with the LAN as a one to many hosts.

  • It communicates with the LAN as a one to nearest host

  • it communicates with the LAN as a one to certain hosts

Explanation

Question 25 of 28

1

What is the IEEE 802.11 standard used for?

Select one of the following:

  • Its used for the physical layer as an enhanced Ethernet transmission access method.

  • Its used for implementing wireless local area network (WLAN).

Explanation

Question 26 of 28

1

IEEE 802.3 standard has 6 bytes for both Source and Destination addresses and 1 byte for both Destination Service Access Point (DSAP) and Source Service Access Point (SSAP).

Select one of the following:

  • True
  • False

Explanation

Question 27 of 28

1

The Ethernet_II frame does not have the DSAP nor the SSAP field but instead has a two byte "Type Field" which is roughly equivalent to the DSAP field of 802.3 frame which relates to the network layer information.

Select one of the following:

  • True
  • False

Explanation

Question 28 of 28

1

Half duplex operates in a shared collision domain and Full duplex operates in a private collision domain.

Select one of the following:

  • True
  • False

Explanation

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