LabYard_

Networking Essentials

Answer all 15 questions, then submit. You need 75% to pass. If you don't pass, the reattempt unlocks after 24 hours.

Q1. The default port for HTTP is:

443 80 8080 21

Q2. DNS TTL values are measured in which unit?

Minutes Milliseconds Hops Seconds

Q3. TCP and UDP operate at which OSI layer?

Application (7) Transport (4) Network (3) Session (5)

Q4. How many steps make up the TCP handshake that opens a connection?

One Three Two Four

Q5. A DNS 'MX' record specifies:

the web server the mail server for the domain the name server an alias

Q6. The default port for HTTPS is:

8443 80 443 22

Q7. How many layers does the OSI model have?

7 5 8 4

Q8. Which ping flag forces it to resolve and use an IPv4 address?

-6 -t -a -4

Q9. IP addressing and routing happen at which OSI layer?

Transport (4) Network (3) Presentation (6) Data Link (2)

Q10. Which service typically uses UDP?

SSH DNS queries SMTP HTTPS page loads

Q11. Why use `traceroute -T` (TCP SYN) instead of the default probes?

It is faster It only maps IPv6 TCP SYN packets are more likely to pass through firewalls that filter ICMP/UDP It hides your source IP

Q12. The ping tool tests whether a host is reachable using which message type?

UDP datagrams ICMP echo requests ARP requests TCP SYN packets

Q13. A DNS 'AAAA' record maps a hostname to:

a name server an IPv4 address an IPv6 address a text value

Q14. DHCP is used to:

automatically assign IP addresses (and config) to hosts route between networks encrypt traffic resolve names to IPs

Q15. `ping -4` is especially useful when:

ICMP is blocked the host is offline DNS is down a domain resolves to IPv6 by default

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