01
Front
What do DNS A and AAAA records map?
Back
An A record maps a name to an IPv4 address; an AAAA record maps a name to an IPv6 address.
Free Online Flashcard Deck
4 Network Services and Modern Architectures Free Online FlashCards
Study 4 Network Services and Modern Architectures with 12 free online flashcards. Review key terms, definitions, and concepts with this interactive flashcard deck.
12 cards
02
Front
What does a DNS record’s TTL control?
Back
A resolver can return a cached answer without repeating the full lookup. The record’s TTL determines how long the cached answer is retained.
03
Front
Which transports does DNS use, and on what port?
Back
DNS normally uses UDP port 53; it also uses TCP, including for some large responses and zone transfers.
04
Front
What are the four steps of the DHCP DORA exchange?
Back
Discover, Offer, Request, Acknowledge. The client finds DHCP servers, receives an offer, requests the configuration, and gets lease confirmation.
05
Front
Why might a subnet need a DHCP relay agent?
Back
A DHCP relay agent forwards client requests between a subnet and a remote DHCP server because client broadcasts ordinarily do not cross routers.
06
Front
How does PAT let multiple private hosts share one public IPv4 address?
Back
PAT lets multiple private hosts share a public IPv4 address by tracking transport-layer ports.
07
Front
Does NAT by itself provide a complete firewall policy?
Back
No. NAT translates address information, but translation alone does not provide a complete security policy.
08
Front
What does NTP do, and what port does it commonly use?
Back
NTP synchronizes clocks across networked systems using a hierarchy of time sources and servers; it commonly uses UDP port 123.
09
Front
What does a directory service organize and provide?
Back
A directory service organizes information about network objects, such as users, groups, computers, and services, and provides ways to search and manage it.
10
Front
What is LDAP used for?
Back
LDAP is a protocol for accessing directory services.
11
Front
What does a cloud route table determine?
Back
A cloud route table chooses the next hop for traffic based on its destination.
12
Front
Does a route to an Internet gateway alone make every subnet host publicly reachable?
Back
A route to an Internet gateway can enable Internet routing, but public reachability also depends on addressing and security rules.