TCP/IP Protocol Architecture ICSSCADA Practice Questions (Page 2)

Questions 6–10

1. 6foundation · easy

   Which statement correctly describes a difference between IPv4 and IPv6 addressing?

   • AIPv6 addresses are always assigned manually, while IPv4 uses DHCP
   • BIPv4 uses hexadecimal notation, while IPv6 uses dotted decimal notation
   • CIPv4 addresses are 32 bits long, while IPv6 addresses are 128 bits long
   • DIPv4 supports multicast, but IPv6 does not
   Reveal Solution Discussion Select an answer first
2. 7foundation · easy

   In the TCP/IP model, which layer is responsible for breaking data into segments and managing end-to-end communication between applications?

   • ANetwork access layer
   • BInternet layer
   • CTransport layer
   • DApplication layer
   Reveal Solution Discussion Select an answer first
4. 8expert · medium

   A control system uses a mix of TCP and UDP protocols. A security audit reveals that the firewall is configured to allow all UDP traffic on the OT network. What is the primary security concern with this configuration?

   • AUDP is slower than TCP, causing delays in control traffic.
   • BUDP encrypts all traffic, making it unreadable to the IDS.
   • CUDP does not support port numbers, making it impossible to filter.
   • DUDP is connectionless and easier to spoof, allowing unauthorized devices to send traffic without a handshake.
   Reveal Solution Discussion Select an answer first
5. 9application · medium

   An engineer is designing a monitoring system that sends periodic status updates from field sensors to a central historian. The updates are small, and missing a single update is acceptable because the next one will arrive in a few seconds. Which transport protocol should the engineer choose?

   • ATCP, because it guarantees delivery of every update.
   • BARP, because it is lightweight and fast.
   • CUDP, because it has lower overhead and no connection establishment delay.
   • DICMP, because it is designed for status messages.
   Reveal Solution Discussion Select an answer first
6. 10application · medium

   A technician is explaining to a new hire how a DNS query from a SCADA workstation travels to the DNS server. The workstation sends a DNS query to the local DNS server. Which sequence correctly describes the encapsulation process as the query leaves the workstation?

   • ADNS query → IP header → UDP header → Ethernet header
   • BEthernet header → IP header → UDP header → DNS query
   • CDNS query → UDP header → IP header → Ethernet header
   • DUDP header → DNS query → IP header → Ethernet header
   Reveal Solution Discussion Select an answer first