Certification Example Test Answers Summary

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Question:

Certification example test

  1. How many IP addresses can one find in the header of an IP packet? A) 1 B) 4 C) 2 D) 3

  2. Collisions are possible in full-duplex Ethernet networks

  3. There’s an IP address 15.242.55.62 with a subnet mask 255.255.255.224 (/27). Please choose all valid host address range within the same subnet. A) 15.242.55.33-15.242.55.63 B) 15.242.55.32-15.242.55.63 C) 15.242.55.31-15.242.55.62 D) 15.242.55.33-15.242.55.62

  4. Select valid MAC-address A) G2:60:CF:21:99:H0 B) 192.168.0.0/16 C) AEC8:21F1:AA44:54FF:1111:DDAE:0212:1201 D) 00:00:5E:80:EE:B0

  5. Which of the following protocols / port s are used for SNMP. (Simple Network Managemnt Protocol) A) UDP 161 B) TCP 162 C) TCP 25 D) TCP 161 E) UDP 162 F) TCP 123

  6. Which of the following are valid IP addresses? A) 10.10.14.0 B) 192.168.256.1 C) 192.168.13.255 D) 1.27.14.254

  7. The basic unit of a physical network (OSI Layer 1) is the: A) Frame B) Bit C) Header D) Byte

  8. Which computers would be able to communicate directly (without any routers involved): A) 10.10.0.17/22 and 10.10.1.30/23 B) 192.168.17.15/29 and 192.168.17.20/28 C) 10.5.5.1/24 and 10.5.5.100/25 D) 192.168.0.5/26 and 192.168.0.100

  9. What protocol does ping use? A) ARP B) TCP C) ICMP D) UDP

  10. What is term for the hardware coded address found on an interface? A) MAC Address B) Interface Address C) IP Address D) FQDN Address

  11. How many layers does Open Systems Interconnection model have? A) 12 B) 6 C) 5 D) 7 E) 9

  12. In MikroTik RouterOS, Layer-3 communication between 2 hosts can be achieved by using an address subnet of: A) /32 B) /29 C) /31 D) /30

  13. Select which of the following are 'Public IP addresses': A) 11.63.72.21 B) 172.28.73.21 C) 10.110.50.37 D) 192.168.0.1 E) 172.168.254.2

  14. How many usable IP addresses are there in a 20-bit subnet? A) 2046 B) 4094 C) 2048 D) 2047 E) 4096

  15. The network address is A) The first usable address of the subnet B) The last address of the subnet C) None of the mentioned D) The first address of the subnet

  16. MAC layer by OSI model is also known as A) Layer 6 B) Layer 1 C) Layer 7 D) Layer 2 E) Layer 3

  17. You have a router with configuration

  • Public IP :202.168.125.45/24
  • Default gateway:202.168.125.1
  • DNS server: 248.115.148.136, 248.115.148.137
  • Local IP: 192.168.2.1/24

Mark the correct configuration on client PC to access to the Internet A) IP:192.168.0.1/24 gateway:192.168.2.1 B) IP:192.168.1.223/24 gateway:248.115.148.136 C) IP:192.168.2.253/24 gateway:202.168.0.1 D) IP:192.168.2.2/24 gateway:202.168.125.45 E) IP:192.168.2.115/24 gateway: 192.168.2.1 18. Which of the following is NOT a valid MAC Address? A) 88:0C:00:99:5F:EF B) 13:16:86:53:89:43 C) EA:BA:AA:EE:FF:CB D) 80:GF:AA:67:13:5D E) 95:B5:DD:EE:78:8A 19. A network ready device is directly connected to a MikroTik RouterBOARD with a correct U.T.P. RJ45 functioning cable. The device is configured with an IPv4 address of 192.168.100.70 using a subnet mask of 255.255.255.252. What will be a valid IPv4 address for the RouterBOARD 750 for a successful connection to the device? A) 192.168.100.71/255.255.255.252 B) 192.168.100.68/255.255.255.252 C) 192.168.100.69/255.255.255.252 D) 192.168.100.70/255.255.255.252 20. Select valid subnet masks: A) 255.255.224.0 B) 255.255.192.255 C) 192.0.0.0 D) 255.192.0.0

Answer:

Here are the answers to the certification example test:

  1. C) 2 - An IP packet header contains the source and destination IP addresses.
  2. False - Collisions are not possible in full-duplex Ethernet networks.
  3. B) 15.242.55.32-15.242.55.63 and D) 15.242.55.33-15.242.55.62 - The valid host address range for a /27 subnet is from 15.242.55.33 to 15.242.55.62.
  4. D) 00:00:5E:80:EE:B0 - This is a valid MAC address format.
  5. A) UDP 161 and E) UDP 162 - SNMP uses UDP port 161 for requests and UDP port 162 for traps.
  6. A) 10.10.14.0 (not usable as a host address), C) 192.168.13.255 (broadcast address, not usable as a host), D) 1.27.14.254 - Valid IP addresses are C and D.
  7. B) Bit - The basic unit of a physical network (OSI Layer 1) is the bit.
  8. C) 10.5.5.1/24 and 10.5.5.100/25 - These two addresses are in the same subnet and can communicate directly.
  9. C) ICMP - The ping command uses the Internet Control Message Protocol (ICMP).
  10. A) MAC Address - The hardware coded address found on an interface is called a MAC address.
  11. D) 7 - The OSI model has 7 layers.
  12. C) /31 - A /31 subnet can be used for point-to-point links, allowing two hosts to communicate directly.
  13. A) 11.63.72.21 - This is a public IP address. The others are private IP addresses.
  14. D) 4094 - A 20-bit subnet allows for 2^(32-20) - 2 = 4094 usable IP addresses.
  15. D) The first address of the subnet - The network address is the first address of the subnet.
  16. D) Layer 2 - The MAC layer is also known as Layer 2 in the OSI model.
  17. D) IP:192.168.2.2/24 gateway:202.168.125.45 - This configuration allows the client PC to access the internet.
  18. D) 80:GF:AA:67:13:5D - This is NOT a valid MAC address due to the 'G' in the second octet.
  19. A) 192.168.100.71/255.255.255.252 - This address is valid for the RouterBOARD to connect to the device.
  20. A) 255.255.224.0 and D) 255.192.0.0 - Both are valid subnet masks.

Feel free to ask if you need further explanations or clarifications on any of the answers!