Networks Questions and Answers

 

 Contents


1 Networks
1.1. Define and describe a VLAN.
1.2. What is a MAC address?
1.3. What are the advantages fiber offers over copper in network wiring?
1.4. Why is it important to main twists to within no less than 1/2” from a punch down panel when working with Category 5 UTP?
1.5. What are the specifications that govern the correct wiring of Category 5 copper cable?
1.6. What switching protocol is used to prevent network loops in a Layer 2 network?
1.7. How does a member of an IP network determine the MAC address of another member in the same subnet?
1.8. How does a member of an IP network determine the MAC address of a system on a different subnet?
1.9. Why is it desirable to use switches instead of hubs in an Ethernet LAN environment?
1.10. What is a DLCI?
1.11. Define and describe the two authentication methods that are available with a PPP connection.
1.12. Define and describe a CSU/DSU.
1.13. What is the difference between a circuit-switched and a packet-switched network?
1.14. What is WEP?
1.15. Describe the current wireless LAN standards, and discuss the pros and cons of each.
1.16. In a Layer 2 switch, what is the difference between cut-through and store-and-forward switching?
1.17. Define and describe FDM and TDM.
1.18. What issues are involved with operating a packet sniffer on a switched Ethernet network?
1.19. You have a Cisco router connecting your LAN to the Internet and you are utilizing the built in firewall capabilities of the Cisco IOS. If a packet traverses your firewall rules and does not match any of them, how does the IOS treat that packet?
1.20. Discuss the pros and cons of stateless and stateful firewalls.
1.21. What is source-address verification, and why is it an important part of firewall implementation?
1.22. What is a DMZ and why is it important?
1.23. Define and describe a VPN.
1.24. Define and describe the two main types of VPNs in use on the internet today.
1.25. Define the private IPv4 subnets, and explain their importance to the security of a network.
1.26. Define NAT and describe the benefits.
1.27. Describe SSL and trusted third-party Certificate Authorities.
1.28. What is the weakest point in every network?
1.29. What is a smurf attack, and how can it be prevented?
1.30. What is a SYN flood, and how can it be prevented?
1.31. RIP is a common, simple routing protocol. What metrics does RIP use to determine the path a packet should take?
1.32. What is the difference between a routing protocol and a routed protocol?
1.33. System A has the IP address 192.168.5.41 and a subnet mask of 255.255.255.248. What are the network address and broadcast address of System A's subnet?
1.34. How many usable IP addresses are there in a subnet that is created by taking a class C subnet and adding a subnet mask of 255.255.255.252?
1.35. What separates IGRP from the simpler routing protocol RIP?
1.36. Examine the following routing table:
1.37. Why is the initial TCP connection between two systems known as a 'three-way handshake'?
1.38. How many TCP and UDP ports numbers are there? What are the three assigned ranges?
1.39. Define and describe CIDR.
1.40. What are the TCP applications associated with the following port numbers?
1.41. What are the seven layers of the OSI Networking model?
1.42. How many bits are there in an IPv4 address?
1.43. Category 5 Unshielded Twisted Pair (UTP) cable is rated for how many meters without a repeater?
1.44. What program is used to display the route between two hosts on a TCP/IP network?
1.45. What protocol does the ping command employ to determine the availability of hosts on a TCP/IP network?
1.46. In an IP subnet, what two IP addresses can you not assign to hosts?
1.47. What is the default subnet for a Class C IP subnet?
1.48. What does the acronym VPN stand for?
1.49. What are the two switching types employed in a Layer-2 switch?
1.50. CSMA/CD is commonly used to describe the capabilities of an Ethernet. What does CSMA/CD stand for?
1.51. A user contacts you and tells you that she cannot access any web sites. All you know about the network setup is that the workstations are TCP/IP hosts on a switched Ethernet network, and they connect to the internet through a DSL line. What are the steps you take to diagnose the problem?
1.52. You issue a ping command on a TCP/IP network, and receive the following response:
1.53. You issue a ping command on a TCP/IP network, and receive the following response:
1.54. You issue a ping command on a TCP/IP network, and receive the following response:
1.55. The traceroute command is used to display the hops between two hosts on a TCP/IP network. Explain why it is sometimes possible to access a web site using HTTP but still be unable to traceroute to it?
1.56. You have a laptop with an 802.11b wireless network card installed. You are near a wireless access point, yet you cannot make a connection. What things do you need to verify in order to establish a connection?
1.57. You have a computer with the IP address of 1.1.1.10. This computer is connected to an Ethernet hub. Also connected to this hub is the first Ethernet interface on a router. The interface on this router has an IP address of 1.1.1.1. The second interface on this router is plugged into a second hub, and has the IP address of 2.2.2.1. Connected to the second hub is a computer with an IP address of 2.2.2.10. Describe the settings that are required in order for the two computers to communicate with each other using TCP/IP.
1.58. What will this command do? tcpdump -i eth0 icmp
1.59. Two computers are connected to a hub with Ethernet cable. Computer A has an IP address of 192.168.1.1 and a subnet mask of 255.255.255.0. Computer B has an IP address of 192.168.2.1 and a subnet mask of 255.255.255.0. Can these two computers communicate over TCP/IP? Why or why not?
1.60. Two Cisco routers are connected by a DCE/DTE cable. Serial0 on Router1 is the DCE and Serial1 on Router2 is the DTE. Both interfaces are assigned IP addresses in the same subnet, and the subnet mask reflects this. However, no data can currently pass between these interfaces, and the 'show int s0' and 'show int s1' commands say that the line protocol is down on both interfaces. What needs to happen before this link can be brought up?
1.61. What is the difference between FTP and SFTP?
1.62. What is the difference between FTP and SSH?
1.63. What is the difference between FTP and Telnet?
1.64. What is the difference between Router and Firewall?
1.65. What is the difference between Router and Bridge?
1.66. What is the difference between VPN and Remote Desktop?
1.67. What is the difference between WINS and DNS?
1.68. What is the difference between DMZ and Firewall?
1.69. What is the difference between POP and IMAP?
2 TCP/IP
2.1. What is the difference between TCP and HTTP?
2.2. What is the difference between TCP and IP?
2.3. ....

 
   

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