Janata Bank Limited Assistant Engineer (IT) Preliminary Exam: 2015প্রশ্ন ও সমাধান

Correct answer: (a) Hypertext Transfer Protocol Secure

HTTPS stands for HyperText Transfer Protocol Secure. It is ordinary HTTP carried over a TLS-secured connection: before any HTTP message is sent, the browser and server set up TLS, which encrypts the traffic and lets the browser check the server's certificate. An https:// URL uses TCP port 443 by default, while plain http:// uses port 80.

Why the other options are wrong

• (b) Hypertext Transfer Protocol System: not an expansion of HTTPS; the extra "S" stands for Secure.
• (c) Hypertext Transfer Protocol Service: also not the expansion; HTTPS is HTTP made secure, not a "service" variant.
• (d) Hypertext Transfer Protocol Sense: a meaningless expansion.

Tip: HTTPS = HTTP + TLS encryption, default port 443.

Sources: HTTPS - Glossary | MDN; RFC 9110: HTTP Semantics

Correct answer: (d) All of these

DNS data is held as resource records, and each record type stores a different kind of information. All three items in the options are standard record types from the core DNS specification:

• NS records name the authoritative name servers for a zone.
• A records (and AAAA for IPv6) map a hostname to an IP address.
• CNAME records make one name an alias of another, canonical name.

Since the database holds all three, "All of these" is the complete answer.

Why the other options are wrong

• (a) Name server Records: NS records are stored, but they are only one record type among several, so this alone is incomplete.
• (b) Hostname-to-address records: A/AAAA records are stored, but NS and CNAME records sit alongside them.
• (c) Hostname Aliases: CNAME records are stored, but they are not the only content of the database.

Tip: Core DNS records: A/AAAA = address, NS = name server, CNAME = alias, MX = mail server, PTR = reverse lookup, SOA = start of authority.

Source: RFC 1035: Domain Names - Implementation and Specification

Correct answer: (d) secondary memory

Swap space is a reserved area on secondary storage (a hard disk or SSD) where the OS keeps pages that have been moved out of RAM. In Linux it is a swap partition or swap file; Windows uses a page file for the same job. When RAM runs short, inactive pages are written to swap, and they are read back into RAM when a process touches them again.

Why the other options are wrong

• (a) CPU: the CPU contains only registers and caches; it cannot hold paged-out memory.
• (b) random access memory: RAM is exactly what swap space is meant to relieve; pages are moved out of RAM into swap.
• (c) primary memory: primary memory is RAM, so this is wrong for the same reason as (b).

Exam note: Option (b) was printed as "random memory"; it is restored to "random access memory". The key is unchanged.

Tip: Swap space / page file = disk area that extends RAM → secondary memory.

Source: Introduction to the page file, Microsoft Learn

Correct answer: (d) 7E0

Convert by repeated division by 16, keeping the remainders:

1. 2016 ÷ 16 = 126, remainder 0
2. 126 ÷ 16 = 7, remainder 14 = E
3. 7 ÷ 16 = 0, remainder 7

Read the remainders from the last to the first: (2016)₁₀ = (7E0)₁₆.

Check: 7 × 256 + 14 × 16 + 0 × 1 = 1792 + 224 + 0 = 2016.

Why the other options are wrong

• (a) 5A0: 5 × 256 + 10 × 16 = 1280 + 160 = 1440, not 2016.
• (b) 7A0: 7 × 256 + 10 × 16 = 1792 + 160 = 1952; the middle digit should be E (14), not A (10).
• (c) 5E0: 5 × 256 + 14 × 16 = 1280 + 224 = 1504; the leading digit should be 7.

Tip: Check any hex answer by multiplying back: first digit × 256, second × 16, last × 1.