What best describes the Open Systems Interconnection model (OSI) ?
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.
What is layer 1: Physical layer ?
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.
What best describes the Data Link 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. It routes packets through logical addressing.
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.
What best describes the Network Layer?
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.
What best describes the Transport Layer?
What best describes the Session Layer?
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.
Its responsible for setting up, managing and tearing down sessions between Presentation Layer entities.
What are examples of the Physical Layer?
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.
What are examples of Data Link Layer?
Physical addressing, Network topology, Flow control and Error notification.
TCP and UDP
IPv4 and IPv6
FIle, print, messages, database and application services
What are examples of Network Layer?
Hubs and Repeaters
What are examples of the Transport Layer? (Pick Two)
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.
What are examples of the Session Layer? (Pick two)
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.
What are examples of the Application Layer? (Pick Two)
Physical Topologies
Telnet, HTTP, Email, SSH, DNS, FTP, SMTP and LDAP, and SNMP.
DHCP
The Data Link Layer provides _____________ transmission of data and handles ____________ notification.
1) fast 2) network
1) physical 2) error
1) access control 2) error
What is the Media Access Control (MAC) IEEE 802.3 ?
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.
What is the Logical Link Control (LLC) IEEE 802.2 ?
MAC address is a _____ bit ___________ address
48 bit hexadecimal address
64 bit hexadecimal address
128 bit hexadecimal address
In a 48 bit MAC address, what represents the first 24 bits and what represents the remaining 24 bits?
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.
What is Ethernet?
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.
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.
What is a unicast?
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
What is multicast?
What is Broadcast?
What is an anycast?
What is the IEEE 802.11 standard used for?
Its used for the physical layer as an enhanced Ethernet transmission access method.
Its used for implementing wireless local area network (WLAN).
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).
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.
Half duplex operates in a shared collision domain and Full duplex operates in a private collision domain.
