makes additional requests in order to resolve a
client query.
A, B, E. The benefits of Network Address
Translation include conserving public IPv4
address space, additional security due to hiding
the addressing for internal networks, and
flexibility and cost savings when changing ISPs.
A. With SNMPv3, the focus was on security, and
additional features such as authentication,
encryption, and message integrity were added to
the protocol specification.
D. The main role of NTP is to synchronize the
time on a network of devices. The IETF
developed NTP, and the latest version of the
protocol, version 4, is defined in RFC 5905. It
uses User Datagram Protocol (UDP) at the
transport layer, and port 123 is reserved for NTP.
B. Layer 3 network diagrams capture all the
network information available at Layer 3. All
devices that operate at Layer 3—routers,
firewalls, load balancers, and so on—and how
they are interconnected should be included in
these diagrams.
C. If DNS is malfunctioning for some reason,
end-to-end connectivity is impacted. Network
tools such as nslookup can be used to
troubleshoot DNS functionality.