# TCS Placement: Sample Questions 212 - 214 of 502

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## Question 212

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### Write in Short

Fill the missing term of the series.

9, 10, 11,13, 15, ________, 21,28

### Explanation

• Divide the given series into two parts of odd and even term series.
• Odd term series: 9, 11,15, 21, …
• Even term series: 10,13, ________, 28, …
• The term which we want to find will follow even term series.
• Here, first term and second term of the series are 10 and 13 respectively. Second term is incremented by 3 numbers, i.e.. Difference between them is + 3.
• Third term needs to find out.
• Fourth term of the series is 28.
• Here, difference between two consecutive terms are increasing in order of + 3, + 6, + 9, + 12, …
• So, Difference between second and third term will be + 6.
• So, missing term will be

## Question 213

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### Write in Short

What are the major data structures used in the following areas: RDBMS, Network data model and Hierarchical data model.

### Explanation

• RDBMS = Array (Array of structures)
• Network data model = Graph
• Hierarchical data model = Trees

## Question 214

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### Describe in Detail

Essay▾

What is a gateway or router?

### Explanation

• A node connected to two or more networks is called a router or gateway.
• It forwards message from one network to another.
• A gateway in a computer network is a key stopping point for data on its way to or from other networks.
• Gateway routes traffic from a workstation to the outside network that is serving up the web pages.
• For example, for internet connection at home gateway is the Internet Service Provider.

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