Quiz 3 — Transport, DNS, and Web Traffic

Five questions covering TCP, UDP, ports, DNS, HTTPS, and TLS.

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Which property is provided by TCP but not by UDP?

Application port numbers

IP addressing

Reliable, ordered delivery with retransmission

Name resolution

Both TCP and UDP use ports, but TCP establishes a connection and provides ordering, acknowledgements, and retransmission.

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What does a destination port identify?

The physical switch port used by the frame

The intended application or service on the destination host

The next router in the path

The VLAN assigned to the source device

An IP address identifies a network interface; a transport port identifies the application endpoint using that address.

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What does DNS primarily provide?

Automatic assignment of subnet masks and gateways

Resolution of names to addresses and other namespace records

Reliable retransmission of lost application data

Encryption of HTTP requests

DNS resolution identifies an endpoint. Routing, policy, and a listening application must still make that endpoint reachable and usable.

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Which statement about HTTPS is correct?

HTTPS is UDP-based HTTP without certificates

HTTPS replaces DNS with certificate lookup

HTTPS carries HTTP over TLS, commonly on TCP port 443

HTTPS encrypts only the destination IP address

TLS protects the application data and provides confidentiality, integrity, and peer authentication. It does not hide normal IP routing information.

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Which three guarantees are associated with TLS?

Address assignment, routing, and translation

Availability, load balancing, and caching

Confidentiality, integrity, and authentication

Ordering, retransmission, and congestion control

TCP provides transport behavior such as ordering and retransmission. TLS protects the application exchange carried over that transport.

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