Quiz
Computer Networking

  1. How many layers does the Open Systems Interconnection Model (OSI) have?
  2. In what layer of the IP/TCP Model is the User Datagram Protocol found?
  3. Compress 02k9:1172:0000:0000:0ln0:490r:9z21:000p.
  4. Compress 47ov:0000:0000:elo55:000a:0000:0000:fuu0.
  5. Compress 0111:1100:fff4:0000:0000:0000:0000:qvmp.
  6. True/False? Firewalls can operate only on one layer of the network.
  7. True/False? In DNS, a Reverse Lookup Zone File resolves an FQDN to an IP address.
  8. True/False? In DNS, a Pointer Resource Record (PTR) resolves a domain name to an IP address. 
  9. With what are twisted-pair copper cables insulated?
  10. At what TCP/IP layer does the Three-Way Handshake occur?
  11. How many levels can an FQDN have?
  12. How many characters can be in each section of an FQDN?
  13. What are the six Control Flags of the data packet at the layer in #2?
  14. What are the Control Flags in the Four-Way Handshake for devices to close a connection at the layer in #2?
  15. What are the most common twisted-pair cables in computer networking?
  16. What happens to an electrical impulse during crosstalk?
  17. True/False? A Cat6 cable transmits data at higher speeds and over longer distances than Cats 5.
  18. True/False? Networks with high electromagnetic interference are best outfitted with copper cables.
  19. What insulates fiber cables?
  20. How can crosstalk lead to a network error?
  21. True/False? Lower-level protocols can request data again if affected by crosstalk.
  22. What TCP/IP layer are MAC Addresses part of?
  23. What's an Access Point?
  24. WLAN, __ ___, and ____ are three kinds of wireless network connections.
  25. At what layer of the TCP/IP Model are protocols introduced?
  26. The Network Access Layer and the Network Interface Layer are other names for what TCP/IP layer?
  27. True/False? Hubs aren't common today because they're prone to collision domain via copper cables.
  28. What are the most common cables used in computer networking?
  29. True/False? Switches are part of the Physical Layer, along with cables; connectors; and switches.
  30. What protocol learns the optimal path by which to forward traffic between networks?
  31. What are the four basic columns of a routing table?
  32. True/False? Hubs remember what devices are connected to each node, while switches cannot.
  33. True/False? Multiple computes can run on the same node. 
  34. True/False? Nodes can be both a server and a client. 
  35. What is modulation?
  36. By default, how many Host IDs does a network lose?
  37. What's another name for modulation in computer networking?
  38. How many bits can a network cable transmit per second?
  39. What's the difference between collision domain and crosstalk?
  40. True/False? Gateway Routers communicate with other Gateway Routers while Core Routers are the entrance/exit to other Core Routers.
  41. What type of address does the ARP protocol resolve?
  42. How many twisted-pair cables are inside each jacket of a Cat6 cable?
  43. An RJ45 Plug terminates what kind of cable?
  44. Two types of lights might appear on an RJ45 Plug -- a Link LED and a _____ LED?
  45. CSMA/CD (Carrier-Sense Multiple Access with Collision Detection) is used by the Ethernet protocol to eliminate what?
  46. What does a Reserved IPv6 Address start with?
  47. What does an IPv6 Address reserved for Multicasting start with?
  48. "Octet" is another name for _____ in computer networking?
  49. True/False? At the Ethernet level, a data payload is everything in a data packet except for the header.
  50. What does "MAC" address stand for?
  51. How many bits does a MAC address have?
  52. What does CSMA/DA stand for?
  53. What is CSMA/DA?
  54. What's the range of IP addresses used for testing purposes?
  55. What class of IP addresses are used for multicasting?
  56. How many octets are in a Subnet Mask?
  57. In general, what kind of cables wire homes with cable television?
  58. At the Ethernet level, what must the least-significant bit in the first octet of a destination MAC address be for a unicast frame? A multicast frame?
  59. Why is "FF:FF:FF:FF:FF" NOT an Ethernet Broadcast Address, despite all its Fs?
  60. In computer networking, a Broadcast involves every LAN device using a broadcast address. True/False?
  61. True/False: Data packets are a highly specialized, structured collection of info presented in a specific order?
  62. Network interfaces at the physical layer can connect into data across a network link. True/False?
  63. Fill in the blanks of the Ethernet Frame: 1. Preamble 2. __________ 3. Destination MAC Address 4. __________ 5. __________ 6. Payload 7. __________
  64. List how many bytes are in each of the fields above.
  65. What section of an Ethernet Frame isn't transported to Payload?
  66. The four configurations of a computer network are the 1) ___ Server 2) IP Address 3) _______ ID and 4) ______ Mask.
  67. What is an important calculator in all computer networking for data integrity?
  68. True/False? Unless the request is too large, a DNS lookup transmits via TCP Datagram rather than UDP Datagram.
  69. The Ethernet protocol reports on data but doesn't perform data recovery. True/False?
  70. How many bits are in an IP address?
  71. What is a Dynamic Host Configuration Protocol (DHCP)?
  72. For IPv4, what's the minimum length, or Header Length, of an IP Datagram?
  73. After the Header Length, what are the 10 other fields of an IP Datagram?
  74. True/False? CIDR allows for more Network ID and/or Host ID space.
  75. Where in the Ethernet Frame is an IP Datagram encapsulated?
  76. What's the Host ID of the subnet mask 255.255.255.0? 
  77. What's the IP address 99.7.129.134 and its subnet mask 255.255.255.252 in CIDR notation?
  78. How many bits are in a TTL field?
  79. True/False? Firewalls run on a host (via the OS) but not on a network device (particularly, the router)?
  80. What category of ports isn't registered with the IANA, and are used for outbound client traffic to a socket?
  81. True/False? CIDR allows for more contiguous Subnet ID space.
  82. True/False? The Subnet ID is derived from the Network ID, not the Host ID. 
  83. True/False? Socket States for TCP connections have the same names but different functions among operating systems.
  84. What's the name of the ports that listen for traffic from common applications?
  85. For platforms that follow the IANA standard, what's the range of ports in question 67?
  86. How many bits are in the Source and Destination IP Addresses, respectively?
  87. What is the payload of an IP Datagram?
  88. What's the Subnet Mask of the IP address 129.8.137.251?
  89. What's the range of the 1st octet of a Class D IP Address?
  90. What's the base-2 notation for a Class C IP Address?
  91. What's the binary value of a Class D IP Address?
  92. A Class D IP Address is used for multicasting. What is multicasting?
  93. What does CIDR, which has mostly replaced the Address Class System, stand for?
  94. At what layer are MAC addresses?
  95. At which two layers of the TCP/IP Model does an 802.11 Frame operate?
  96. What is an ARP (Address Resolution Protocol)?
  97. True/False? The IP Datagram forms while encapsulated in the Ethernet Frame.
  98. True/False? A destination MAC address is necessary for a transmitting device to complete the Ethernet Frame header.
  99. Which receives the response to an ARP Response: the host device or the server?
  100. How many bits is a subnet mask?
  101. How many bytes is an IP Datagram header in IPv4?
  102. How many numbers less than the Host ID can a subnet ID have?
  103. What is 255 reserved for in a subnet?
  104. True/False? It's not standard to refer to the entire number of host IDs available for a subnet?
  105. How many bits are in Class B of a network ID, or for subnetting?
  106. How many bits are in Class C of a network ID, or for subnetting?
  107. CIDR has replaced much of the Address Class System. What does CIDR stand for?
  108. True/False? A Loopback Address redirects traffic back to the same node.
  109. What demarcates a network in CIDR?
  110. In IPv6, how many bits make up the Network ID? The Host ID?
  111. What's the Loopback Address for IPv4?
  112. What's the Loopback Address for IPv6?
  113. True/False? The IP address and the subnet mask are the same length?
  114. What layer is the MAC address part of?
  115. True/False? An incorrect subnetting setup is a common IT problem.
  116. True/False? The Host ID identified what gateway network to send a datagram.
  117. True/False? The gateway router extracts the IP Datagram from the Ethernet Frame when inspecting it for a destination address.
  118. What's the most common protocol at the Application Layer? The Data Link Layer?
  119. How many IP addresses does a Class B Address Class System have?
  120. What operator does a computer use to determine if an IP address exists on the same network?
  121. What are two types of Interior Gateway Protocols?
  122. True/False? DSLAMS are the demarc for fiber-optic networks and Optical Network Terminals (ONT) for DSL?
  123. True/False? Interior Gateway Protocols share info within multiple nodes of an autonomous system.
  124. An Autonomous System is a collection of independent networks controlled by a single operator. What is an example of an Autonomous System?
  125. What are Link-Local Unicast Addresses in IPv6?
  126. True/False? ASNs (Autonomous System Numbers) are 64-bit numbers in decimal notation.
  127. True/False? An ASN never changes when it represents more networks or hops, just its core routing table.
  128. True/False? ISPs are where Exterior Gateway Protocols are significant in IT.
  129. What's the most common Link-State Protocol? (Hint: OSPF)
  130. What is a Non-Routable Address Space?
  131. What are the three IP addresses reserved for Non-Routable Address Space?
  132. True/False? NAT (Network Address Translation) allows computers on a Non-Routable Address Space to communicate with other network devices on the Internet.
  133. How many bits are in a port?
  134. What is 10.1.1.100:80 an example of?
  135. What is Port 25? Port 9100? Port 21?
  136. Fill in the blanks for the TCP Header: Source Port (     ) | Destination Port (     ) ||||| _________________________ (32) ||||| Acknowledgment Number (32) ||||| _______________ (4) | _______________ (16) ||||| Options (     ) | Padding ||||| __________ (Varies)
  137. True/False? Source ports are chosen from ports known ephemeral ports.
  138. True/False? The Urgent Pointer Field of a TCP Header is a major part of modern computer networking?
  139. What are the 2 additional layers of the OSI Model?
  140. True/False? RST can indicate the server hasn't recovered from malformed or missing segments in a TCP connection.
  141. True/False? An ACK of "1" indicates no need to examine the acknowledgment number.
  142. What is buffering?
  143. What's the Socket Address or Socket Number of a program listening on port 21 of a node at 35.55.75.95?
  144. True/False? SYN in the Control Flag ensures the transmitting end knows to examine the Sequence Field.
  145. After the Recursive Name Server sends a request to the Root Name Server, to what DNS Server type does the Root Server direct its inquiry in turn?
  146. How many root servers are there?
  147. The __________ Name Server redirects a query to the client computer performing the lookup with the __________ Name Server to contact?
  148. What are the 5 DNS Server Types?
  149. On what UDP port does DHCP listen for a DHCP Discovery broadcast?
  150. From what UPD port are DHCP Discovery broadcasts sent?
  151. DNS listens on what port?
  152. True/False? UDP has error recovery.
  153. How many data packets does it take a Name Resolution at the Application Layer?
  154. Unless the request is too large to fit into a single datagram, DNS normally uses what protocol from the Transport Layer?
  155. True/False? BGP -- an Exterior Gateway Protocol -- is most likely to transmit data between Autonomous Systems or ASNs.
  156. True/False? A domain can't point to many/different IP addresses.
  157. True/False? Many domain names can't point to the same IP address 
  158. What 4 things must be configured for each computer on a TCP/IP-based network?
  159. A DHCP ACK has an expiration before which the client must re-negotiate a lease for DHCP configuration info? T/F?
  160. What type of datagram is the payload section of an Ethernet Frame made of? 
  161. What does DSL stand for?
  162. DSL and Dial-Up Connection both transmit data over phone lines. They also use the same type of modems to do so? True/False?
  163. True/False? A Cyclical Redundancy Check can't fail if cross talk within a twisted-pair cable is only minor.
  164. In macOS and Linux, how does an end user send an interruption event to stop a ping command?
  165. In macOS and Linux, what are the two mandatory arguments of a netcat (nc) command?
  166. What are the six IP Addresses for Level 3 Communications' Public DNS Server?
  167. What are the two IP Addresses for Google's Public DNS Server?
  168. An IPv6 Address has how many bits?
  169. What's another name for a modem? (Hint: _________/___________)
  170. How many kilobytes (KB) are in a megabyte (MB)?
  171. What two bands does WiFi commonly operate on?
  172. In the IPv6 protocol, what's the equivalent of DHCP?
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Related: Computer Networking 2 (Notes)
Related: Computer Networking 3 (Notes)
Related: Operating Systems (Quiz)
Related: "Cybersecurity and Cyberwar" (2020)