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CCENT Chapter 2
CCENT Chapter 2
23
Computer Networking
Not Applicable
06/17/2013

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Term
TCP/IP updated stack
Definition
Application, Transport, Internetwork, Data Link, Physical
Term
OSI Stack
Definition
7 Application, 6 Presentation, 5 Session, 4 Transport, 3 Network, 2 Data Link and 1 Physical
Term
Application layer protocol example
Definition
Telnet, HTTP, FTP, SMTP, POP3, VoIP, SNMP
Term
Transport layer protocol example
Definition
TCP, UDP
Term
Internetwork layer protocol example
Definition
IP
Term
OSI Layer 7
Definition
Application- Interface between the communications software and the applications. Also does user authentication.
Term
OSI Layer 6
Definition
Presentation- Define and negotiate data formats (e.g., ASCII). Also covers encryption.
Term
OSI Layer 5
Definition
Session- Defines how to start, control and end conversations.
Term
OSI Layer 4
Definition
Transport – Focuses on data delivery to another computer (e.g., error recovery and flow control)
Term
OSI Layer 3
Definition
Network - Logical addressing, routing and path determination.
Term
OSI Layer 2
Definition
Data Link - Defines rules that determine when a device can send data over a particular medium. Format for header and trailer that allows a device to successfully send and receive data.
Term
OSI Layer 1
Definition
Physical - Physical characteristics such as medium, connectors, pins, electrical characteristics, encoding, modulation and rules to activate and deactivate the use of physical medium.
Term
Data Link layer protocol example
Definition
Ethernet (IEEE 802.3), HDLC, Frame Relay, PPP
Term
PhysicaL layer protocol example
Definition
RJ-45, EIA/TIA-232, V.35, Ethernet (IEEE 802.3)
Term
Session - Application (L5 - L7) Device
Definition
Firewall, intrusion detection systems, hosts
Term
Transport (L4) Device
Definition
Hosts. Firewalls.
Term
Network (L3) Device
Definition
Router
Term
Data Link (L2) Device
Definition
LAN switch, wireless access point, cable modem, DSL modem.
Term
Physical (L1) Device
Definition
LAN hub, LAN repeater, cables.
Term
OSI Layer mnemonic
Definition
All People Seem To Need Data Processing
Term
Layering Benefits
Definition
Less complex – model broken into smaller parts
Standard interface – multiple vendors and open competition
Easier to learn- model broken into smaller parts
Easier to develop- model broken into smaller parts
Multiple Vendor Interoperability- equipment from multiple vendors can work in the same network.
Modular engineering- one vendor writes some layers, another vendor other layers.
Term
Adjacent layer interaction
Definition
the higher-layer asks for the next lower-layer protocol to perform the service; the lower layer provides a service to the layer above it.
Term
Same layer interaction
Definition
two computers set and interpret the information in the header used by that layer. Occurs between different computers.
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