CCENT Review

CCENT Review

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CCENT Review

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1. CCENT Review

2. Put the following descriptions in order from Layer 7 to Layer 1 and give the name of each layer

4. Which addresses are valid host IP addresses given the network 172.16.32.8 subnet mask 255.255.255.248? • Shortcut 256-248=8 • Range 8 in last octet • 172.168.32.8 – 172.168.32.15

5. 192.168.102.65/27 32 hosts on each subnet 192.168.101.64-95 73 ok 81 ok 192.168.102.97/27 32 hosts on each subnet 192.168.101.96-127 123 ok 148 OUT OF RANGE

6. A network host has the IP address 10.250.206.55/20. How many more network devices can be added to this same subnetwork?

7. A network host has the IP address 10.250.206.55/20. How many more network devices can be added to this same subnetwork? • /20 = • 11111111.11111111.11110000.00000000 • NOTE - 255.255.XXX.0 (XXX – interesting octet) • 2 ^ 12 = 4096 • 4096 – 3 = 4093

8. To which subnetwork does this packet belong? 10.149.177.135/14

9. To which subnetwork does this packet belong? 10.149.177.135/14 • /14 subnet mask 255.252.0.0 • 10.149.177.135 • 00001010.10010101.10110001.10000111 AND • 11111111.11111100.00000000.00000000 EQUALS • 00001010.10010100.00000000.00000000 binary • 10.148.0.0 Network • 10.151.255.255 Broadcast

10. The router receives a packet with the destination address of 172.16.30.79. To which subnetwork does this packet belong? 172.16.0.0/21172.16.20.0/21172.16.24.0/21172.16.28.0/21172.16.32.0/21

11. The router receives a packet with the destination address of 172.16.30.79. To which subnetwork does this packet belong? /21 = 11111111.11111111.11111000.000000002^3=8172.16.0.0/21 = 172.16.0.0 – 172.16.7.255172.16.20.0/21 20 not a multiple of 8172.16.24.0/21 = 172.16.24.0 – 172.16.31.255172.16.28.0/21 28 not a multiple of 8172.16.32.0/21 = 172.16.32.0 – 172.16.39.255

12. How many collision and broadcast domains are show in the following network topology?

13. If all the switches have the default configuration, how many collision and broadcast domains are show in the following network topology? Collision – 12 Broadcast – 3

14. What is the function of the router in this topology?

15. What is the function of the router in this topology?Determines the path to send the message to get to a destination network.Each port, or interface, on a router connects to a different local network. Every router contains a table of all locally-connected networks and the interfaces that connect to them. These routing tables can also contain information about the routes, or paths, that the router uses to reach other remote networks that are not locally attached. When a router receives a frame, it decodes the frame to get to the packet containing the destination IP address. It matches the address of the destination to all of the networks that are contained in the routing table. If the destination network address is in the table, the router encapsulates the packet in a new frame in order to send it out. It forwards the new frame out of the interface associated with the path, to the destination network. Routers contain broadcasts.

16. The default gateway address is the address of the router interface connected to the same local network as the source host. All hosts on the local network use the default gateway address to send messages to the router. Once the host knows the default gateway IP address, it can use ARP to determine the MAC address. The MAC address of the router is then placed in the frame, destined for another network.

17. What tables are maintained by routers?

18. What tables are maintained by routers? If the router cannot determine where to forward a message, it will drop it. Configure a routing table with a default route to keep a packet from being dropped. A default route is the interface through which the router forwards a packet containing an unknown destination IP network address.

19. Identify the following as a unicast, broadcast or multicast.

20. A company has an 802.11b wireless access point installed. Which type of wireless NIC is a valid standards-based one but will not work in this environment?

21. A company has an 802.11b wireless access point installed. Which type of wireless NIC is a valid standards-based one but will not work in this environment? 802.11a

22. Match the wireless term to its definition.

23. Match the wireless term to its definition.

24. Once a hacker gains access to the network, what are the four types of threats?

25. Once a hacker gains access to the network, what are the four types of threats? • Information theft • Identity theft • Data loss / manipulation • Disruption of service

26. What command is described below? • Tests the accessibility of a specific IP address • Sends an ICMP (Internet Control Message Protocol) echo request packet to the destination address and then waits for an echo reply packet to return from that host • Output indicates whether the reply was received successfully and displays the round-trip time for the transmissions

27. What command is described below?Answer - ping • Tests the accessibility of a specific IP address • Sends an ICMP (Internet Control Message Protocol) echo request packet to the destination address and then waits for an echo reply packet to return from that host • Output indicates whether the reply was received successfully and displays the round-trip time for the transmissions

28. Draw a picture using each of the following cables.

29. Describe what has to happen for this packet to continue.

30. Describe what has to happen for this packet to continue.

31. Describe what has to happen for this packet to continue.

32. Describe what has to happen for this packet to continue.

33. Which type of Network Address Translation allows a host on a public network consistent access to a specified private inside host? Static NAT Dynamic NAT PAT

34. Which type of Network Address Translation allows a host on a public network consistent access to a specified private inside host? Static NAT Dynamic NAT PAT