Telecom Protocol Testing Interview Questions Pdf

Telecom protocol testing interview questions pdf

Before we learn about protocol testing, let's understand: What is Protocol?

Drive Test Engineer ( To ) LTE Protocol Engineer

When a computer communicates with each other, there is a common set of rules and conditions that each computer has to follow. In other words, protocols determine how data are transmitted between computing devices and over networks.

What is Protocol Testing?

Routed and Routing Protocols

The goal is to check the structure of packets which are sent over a network using protocol testing tools. Routed and Routing Protocols Protocols are classified into two categories routed protocols and routing protocols Routed Protocols : Routed protocols can be used to send the user data from one network to another network.

It carries user traffic like e-mails, web-traffic, file transfers, etc. Routing Protocols : Routing protocols are network protocols that determine routes for routers.

Telecom protocol testing interview questions pdf

It is only used between routers. In simple terms, a router is like a bus used for transportation while routing protocols are signals on the road.

What is Protocol Testing?

Based on the type of communication different protocols are used. Layer 2 : It is a data link layer.

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Layer 3 : It is a network layer that determines the best available path in the network for communication. An IP address is an example of layer3. How to do Protocol Testing For protocol testing, you need protocol analyzer and simulator Protocol analyzer ensures proper decoding along with call and session analysis.

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While simulator simulates various entities of networking element Usually, a protocol testing is carried out by DUT device under test to other devices like switches and routers and configuring protocol in it Thereafter checking the packet structure of the packets sent by the devices It checks scalability, performance, protocol algorithm etc.

During protocol testing basically, three checks are done. Correctness : Do we receive packet X when we expected Latency : How long does a packet take to transit the system Bandwidth : How many packets we can send per second Protocol testing can be segregated into two categories.

Stress and Reliability Tests and Functional Tests. While Functional Testing includes negative testing, conformance testing, interoperability testing, etc.

Essential Telecom Protocols Interview Questions & Answers:

Interoperability Testing : The interoperability for different vendors are tested. This testing is done after conformance testing is done on the appropriate platform Network feature Testing: The features of networking products are tested for functionality with reference to the design document.

For example, features can be port-security on a switch, ACL on a router etc. It should not allow a user to access Line speed Check the device operating at 10Gbps speed, utilizing all the available bandwidth to handle incoming traffic Protocol conversation rate Track a TCP conversation between two devices and verify that each device engaged in a correct behavior Response time for session initiation Measure the response time of a device to an invite request for session initiation Tools for Protocol Testing Let's discuss the most important testing tools used to verify protocols Scapy For Packet Crafting Scapy is a powerful interactive packet manipulation program.

It enables you to Create packets Decode packets on the network Capture packets and analyze them Inject packets into the network So basically, scapy mainly does two things: receiving answers and sending packets.

You define the packets, it sends them, receives answers, matches requests with answers and returns a list of packet couples and a list of unmatched packets. It can also handle other things as well like trace-routing, unit tests, attacks or network discovery, developing new protocols, probing, etc. Scapy enables us to write a Python script that allows us to perform a task like sending and receiving packets or sniffing packets.

Protocol Testing Interview Questions and Answers

For example, scapy can sniff the data packet by using a Python script. The command to open the getdit entered in the editor gedit scapysniff.

Telecom protocol testing interview questions pdf

Scapy also as an array of command for sending and receiving packets at the same time Download Scapy Wireshark Tools For Analysis Tools used for protocol testing- Wireshark. It allows to capture packets in real time and display them in human-readable form.

Telecom protocol testing interview questions pdf

It allows you to dig deep into the network traffic and inspect individual packets by using color coding and filters. Wireshark captures packets that helps to determine when the session is getting established, when the exact data travel was initiated and how much data is sent each time, etc.

Protocol Testing Interview Questions: Part 1

For example, a coffee vending machine that gives you coffee on inserting a dollar coin but does not respond if anything less than a dollar is inserted into it. To program such machines TCCN3 language is used.

Telecom protocol testing interview questions pdf

It allows us to run our test before an actual coffee machine is available as a product. Once it is done we will connect the TCCN3 test suite with the external device. The test system emits stimuli dollar coin and receives responses coffee. The stimuli adapter obtains stimuli from the test system and passes them to the system under test. The response adapter waits for responses of the system under test and passes them to the test system. TCCN3 core language exists in text format apart from other formats like tabular, graphical and presentation.

Telecom protocol testing interview questions pdf

What is Software Engineer? A software engineer is a professional who applies the principles of They are What is Response Time Testing?

Telecom Domain Testing: Protocol Testing and Telecom Testing Tools

Code coverage is an important measure that quantifies the degree to which the source code of the What is 'Defect Triage'? Defect triage is a process where each bug is prioritized based on its Home Testing. Must Learn! Big Data.

Telecom protocol testing interview questions pdf

Live Projects. Routed Protocols : Routed protocols can be used to send the user data from one network to another network. It should not allow a user to access Line speed Check the device operating at 10Gbps speed, utilizing all the available bandwidth to handle incoming traffic Protocol conversation rate Track a TCP conversation between two devices and verify that each device engaged in a correct behavior Response time for session initiation Measure the response time of a device to an invite request for session initiation.

Build two different VLANs.

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Check the visibility between hosts on different VLANs. Check how spanning tree protocol avoids the formation of cycles in the network, blocking redundant links, in presence of VLANs too. Generate telephone calls and check whether the telephone switch still operates or its performance degrades.

Enter the incorrect key and check the user for authentication.

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It should not allow a user to access. Check the device operating at 10Gbps speed, utilizing all the available bandwidth to handle incoming traffic. Track a TCP conversation between two devices and verify that each device engaged in a correct behavior. Measure the response time of a device to an invite request for session initiation.