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List the 7 layers of the OSI model
- Physical
- Data Link
- Network
- Transport
- Session
- Presentation
- Application
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List characteristics of the Physical Layer (1) of the OSI model
Characteristics: Voltage levels, timing of voltage changes, physical data rates, maximum transmission distances, physical connectors
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In what layer of the OSI model are ports assigned?
Layer 4 - The session layer
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What is the protocol for Internet Assigned Number Authority (IANA)
Port 80 ?
HTTP (Hypertext transfer protocol)
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What is the protocol for Internet Assigned Number Authority (IANA)
Port 23 ?
Telnet protocol (TCP)
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What is the protocol for Internet Assigned Number Authority (IANA)
Port 21 ?
FTP – control (command)
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What is the protocol for Internet Assigned Number Authority (IANA)
Port 69 ?
Trivial File Transfer Protocol (TFTP) (TCP)
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What is the protocol for Internet Assigned Number Authority (IANA) Port 22 ?
Secure Shell (SSH)—used for secure logins, file transfers (scp, sftp) and port forwarding (TCP & UDP)
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What is the protocol for Internet Assigned Number Authority (IANA) Port 25 ?
Simple Mail Transfer Protocol (SMTP)—used for e-mail routing between mail servers
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What is the protocol for Internet Assigned Number Authority (IANA) Port 443 ?
HTTPS (Hypertext Transfer Protocol over SSL/TLS)
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Describe the data link layer
- Layer 2
- Defines how data is formatted for transmission an how access to teh network is controlled.
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What layer of the OSI model provides error detection ?
Layer 2 - Data Link Layer
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Hub, Cables, Interconnections, repeater are included in what layer of the OSI model
Layer 2 - Data Link Layer
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A switch is contained in which layer of the OSI model?
Layer 2 Data Link Layer
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A router is contained in which layer of the OSI model?
Layer 3 - Network Layer
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What layer of the OSI model is associate with these protocols?
Ethernet
Serial-HDLC
Frame-relay (FR)
PPP (Multiplexed)
Layer 2 - Data Link Layer
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What layer of the OSI model is associated with IP, IPV4, IPV6 ?
Layer 3 (Network Layer)
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What layer of the OSI model is associate with these protocols?
RIP
TCP/UDP
GRE
ICMP
Layer 4 (Transport layer)
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What layer of the OSI model is assoicate with these source/destination information?
EXP
EIGRP
OSPF
IGP
Layer 4 (Transport Layer)
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Is an IP address visible at Layer 2?
No...mac address at this layer
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Describe characteristics of Layer 3 (Network Layer) of the OSI model?
- Data Delivery
- Routes data packets
- Selects best path to deliver data
- Provides logical addressing and path selection
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Name the layer and describe characteristics of the Layer 4?
- Transport Layer
- End-to-End Connections* Handles transportation issues between hosts
- * Ensures data transport reliability
- * Establishs maintains and terminates virtual circuits
- * Provides reliability through fault detection and recovery information flow control
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Name the layer and describe characteristics of the Layer 4?
- Transport Layer
- End-to-End Connections* Handles transportation issues between hosts
- * Ensures data transport reliability
- * Establishs maintains and terminates virtual circuits
- * Provides reliability through fault detection and recovery information flow control
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Name the layer and describe characteristics of the Layer 4?
- Transport Layer
- End-to-End Connections* Handles transportation issues between hosts
- * Ensures data transport reliability
- * Establishs maintains and terminates virtual circuits
- * Provides reliability through fault detection and recovery information flow control
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Name Layer 5 of the OSI model and list some characteristics
- Session Layer - 5
- establishes, manages, and terminates sessions between applications
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Which layer of the OSI model synchronized dialog between the presentation layers of the two hosts and manages their data exchange?
Layer 5 - Session Layer
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Which layer of the OSI model provides for Class of Service (CoS) and exception reporting from session layer, presentation layer and application layer problems.
Layer 5 - Session Layer
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List the layer number and some characteristics of the Presentation Layer
- Layer 6 - Presentation
- * Ensures that data is readable by receiving system
- * Formats data
- * Structures data
- * Negotiates data transfer Syntax for application layer
- * provides encryption
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Which layer of the OSI model provides encryption?
Layer 6 - Presentation Layer
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What is the name for Layer 7 of the OSI model and list some characteristics
- Layer 7 - Application Layer
- * Provides network services to application processes (such as email, file transfer and terminal emulation)
- * provides user authentication
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what layer of the OSI model provides these network services?
email
file transfer
terminal emulation
Layer 7 - Application Layer
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List four layers layers of the TCP/IP stack
- 1. Application
- 2. Transport
- 3. internet
- 4. Network Access
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