Mobile Telecommunication Technologies, Network Security and Internet Services

  • Question 1
    CBSEENCO12011556

    Differentiate between Radio Link and Microwave in context of wireless communication technologies.

    Solution

    Radio Link: Data is transmitted outward from the antenna through free space in all directions. It is a Slow means of communication.

    Microwave: Data is transmitted based on a line of sight principle, faster than radio communication.

    Specifications

    Radio 

    Microwave

    Frequency range(Hz)

    3 x 105 to 3 x 1011

    3 x 108 to 3 x 1011

    Wavelength

    103 to 10-3 meters

    1 to 10-3 meters

    Applications

    Mobile,AM/FM radio, television

    radar, satellite and space communication

    Question 2
    CBSEENCO12011557

    Amit used a pen drive to copy files from his friend’s laptop to his office computer. Soon his office computer started abnormal functioning. Sometimes it would restart by itself and sometimes it would stop functioning totally. Which of the following options out of (i) to (iv), would have caused the malfunctioning of the computer. Justify the reason for your chosen option:

    • Computer Worm

    • Computer Virus

    • Computer Bacteria

    • Trojan Horse

    Solution

    B.

    Computer Virus

    D.

    Trojan Horse

    (i) Pen drive containing Computer Virus / Trojan Horse was used before the abnormal functioning started, which might have corrupted the system files.
    (ii)Computer Virus/ Trojan Horse affects the system files and start abnormal functioning in the computer

    Question 3
    CBSEENCO12011558

    Jai is an IT expert and a freelancer. He recently used his skills to access the Administrator password for the network server of Megatech Corpn Ltd. and provided confidential data of the organization to its Director, informing him about the vulnerability of their network security. Out of the following options (i) to (iv), which one most appropriately defines Jai. Justify the reason for your chosen option:

    • Hacker

    • Cracker

    • Operator

    • Network Admin

    Solution

    A.

    Hacker

    A Hacker is a person who breaks into the network of an organization without any malicious intent.

    Question 4
    CBSEENCO12011604

    Janish Khanna used a pen drive to copy files from his friend’s laptop to his office computer. Soon his office computer started abnormal functioning. Sometimes it would restart by itself and sometimes it would stop different applications running on it. Which of the following options out of (i) to (iv), would have caused the malfunctioning of the computer? Justify the reason for your chosen option:

    • Computer Virus

    • Spam Mail

    • Computer Bacteria

    • Trojan Horse

    Solution

    A.

    Computer Virus

    D.

    Trojan Horse

    Computer virus can spread through external media such as CDs, pen drive etc. It is designed to infect the host program and gain control over the system without the owner’s knowledge.

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