OSI Model Interview Questions and Answers CCNA

OSI Model Interview Questions and Answers CCNA networkingguruji1.com/2020/02/osi-model-interview-questions-and-answer-ccna.html

OSI Model Interview Questions and Answers CCNA

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Previous Topics:- ACL Interview Questions and Answers in CCNA What is the network model Network Model is a set of documents where each document defines a network function (protocols, physical requirements).

Give some examples of the network model

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OSI model, TCP/IP model, SNA model.

Why do we need model Networking models are easy to understand, describe and analyze data communications.

What is the full form of DoD Model DoD stands for the Department of Defense.

What are the layers of the TCP/IP model TCP/IP model has originally 4 layers, but an updated version, it has 5 layers.

Application or Process Layer Transport or Host-to-Host Layer Network or Internet Layer Link or Network Access Layer Physical Layer What are the layers of the OSI model OSI model has 7 layers.

Layer7: Application Layer6: Presentation Layer5: Session Layer4: Transport Layer3: Network Layer2: Data Link Layer1: Physical What is the function of Application Layer The application layer is the closest to the end-user. It is giving space to use to interact with Software or Application.

Give some examples of protocols of application layer HTTP, HTTPS, POPv3, SMTP, FTP, TFTP, SNMP, TELNET, SSH, BGP, DHCP, DNS, NTP. What is the function of the Transport layer

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This layer is responsible for how Data will be delivered and defines well-known ports.

Which is the protocols of the Transport layer TCP or Transmission Control Protocol UDP or User Datagram Protocol

CCNA STP Interview Question and Answer.

What is the difference between TCP and UDP TCP Header Size is 20 byte Slow down process FTP, HTTP, Telnet, DNS, etc use TCP Connection oriented protocol UDP Header Size 8 Bytes Faster than TCP 3/7

Used by DHCP, DNS, real-time services.

Connectionless protocol What is port numbers in the Transport layer Port number defines every session uniquely by a decimal value in Transport Layer. This is logical Port numbers is used to identify the application.

What is the function of ports at Transport layer Port numbers are used to differentiate the sessions and identifies the application.

Which are well-known port numbers 0-1023 are well-known ports.

What is the range of port numbers 0-65535.

Give some example of port numbers with their services FTP Data: TCP: 20 FTP Control: TCP: 21 SSH: TCP: 22 Telnet: TCP: 23 SMTP: TCP: 25 DNS: TCP/UDP: 53 DHCP Server: UDP: 67 DHCP Client: UDP: 68 TFTP: UDP: 69 HTTP: TCP: 80 POPv3: TCP: 110 SNMP: UDP: 161 SSL: TCP: 443 Sys Log: UDP: 514 Which service does use both TCP and UDP at transport layer protocol DNS What is the function of the Internet/Network layer 4/7

Routing Protocol and Routed protocol works here.

Which devices are used at Internet layer Router, Layer3 switch.

Configuring basic VTP on CISCO Switches What is the function of the Data Link layer Provides services to the upper layer.

Defines hardware and protocols to deliver data across the physical network/link.

What are the protocols and devices of Data Link Layer Protocols are Ethernet, Token Ring, FDDI, HDLC, PPP, etc.

Devices used in this layer are Switch, Bridge.

What is the function of the Physical layer 5/7

The physical layer function is related to the physical transmission of data. Like speed, duplex, hardware, etc.

Give some examples of physical layer devices HUB, Modem, Repeater What is the function of Presentation and Session layers Presentation Layer: Negotiates data format, such as ASCII for text and JPEG for an image.

Encrypts data, compress data.

Session Layer: Starts maintain, ends a network session.

What is PDU PDU stands for Protocol Data Unit. A generic term for data at each layer in the OSI model.

What is the PDU of different layers of the OSI model Application: Data Presentation: Data Session: Data Transport: Segment Network: Packet Data Link: Frame Physical: Bits What do you mean by Encapsulation and De-Encapsulation Encapsulation is adding a header or trailer to the data De-encapsulation is removing and discarding the header and trailer from the data.

What is TCP 3-way handshaking TCP session establishment process between 2 hosts. It is a 3-way process in which each host responds with an SYN and ACK message to each other. This process is known as TCP 3-way handshaking process.

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CCNA Interview Questions and Answers in 2020 What is TCP Flow Control Flow Control is a process to control the data flow between Sender and Receiver.

What is TCP Windowing How many data can be sent at a time before waiting for an acknowledgment.

What is the LLC layer The LLC (Logical Link Control) a layer will determine what protocol is being used and ports for the upper layer (Network Layer) processing, it also does error checking.

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