Section – I:
1) Explain why the performance of an Ethernet LAN decreases with an increase in the number of stations on the LAN, whereas it increases (at least initially) with the increase in the number of stations in a token-ring LAN?
A) There are too many differences between Token Ring and Ethernet to list out here. You could read more about it from many useful search results for "ethernet vs. token ring." I'll point out a key difference and give you a source answering your question on performance.

Ethernet is based on CSMA/CD (carrier sense multiple access with collision detection), meaning multiple stations sense the carrier at the same time and send data when the carrier is free. However, there might be multiple stations sending a free carrier and send the data at the same time, causing "collision." Collision is the main factor affecting ethernet's performance. The more stations on the same LAN, the higher the collision rate, the lower the performance.

Token Ring, on the other hand, is based on a control/access given to the station owning the "token." Think of a token as the key to the media: whichever station has the token would be allowed to use the ring to send the data. So there would be no collision, just multiple stations competing for the same token. With not too many stations, the wait-for and claim of the token is very efficient (think of a video game with less players waiting to play it.) But if there are too many stations, most would just sit around and wait for the token, hence the flat-out of its performance.
2) What are the standards used for the various layers in an Ethernet-based network that is managed by the Internet management protocol? Assume that the Ethernet runs on 10 Mbps on an unshielded twisted-pair cable?
A) The standards used for the various layers in an Ethernet-based network that is managed by the Internet management protocol are : a. Organizational Model b. Information Model c. Communication Model d. Functional Model The organizational model describes the components of network management and their relationships. The information model is concerned with the structure of information. The communication model describes on how the information is exchanged between systems. The functional model addresses user-oriented applications.
3)

6) Communication between two ATM switches is broken in a private ATM network. You are troubleshooting the problem from a network management station. What M interfaces would you use?
A) The M2 interface is used to manage the private ATM network. The management information on ATM links between devices is gathered from ILMI MIB. The ILMI specifications define the administrative and UNI groups of the ATM forum MIB. The administrative group defines a general-purpose registry for locating ATM network services such as the ATM name answer server (ANS). Other subgroups under the administrative group have been deprecated and handled by IEFT specifications.

Section – II

1) The basic network monitoring tools that will be used are :
a. ping
b. bing
c. tcpdump
d. getethers
e. iptrace
f. ethereal / wireshark
We would be looking at the results for packets containing information on protocol type, length, source and destination.

2) The following group of commands enable Telnet access to the router:
Router(config)# enable password class
Router(config)# line vty 0 4
Router(config-line)# login
Router(config-line)# password cisco

3) The two situations which requires a network administrator to use out-of-band management to change a router configuration are :
a. Network links to the router are down.
b. The network interfaces of the router are not configured with IP addresses.

4) The two approaches which allows network administrators to be able to examine and configure network devices from their homes without increasing vulnerability to external attacks are :
a. Set up VPN access between the home computer and the network.
b. Configure ACLs on the edge routers that allow only authorized users to access management ports on network devices.

5) A network administrator must define specific business processes to implement if a catastrophic disaster prevents a company from performing daily business routines. The portion of the network documentation the administrator is defining will be :
a. business continuity plan

6) A DoS attack crippled the daily operations of a large company for 8 hours. The two options which could be implemented by the network administrator to possibly prevent such an attack in the future are :
a. Install security devices with IDS and IPS at the enterprise edge.
b. Filter packets based on IP address, traffic pattern, and protocol

7) A network manager wants to have processes in place to ensure that network upgrades do not affect business operations. The document / plan that the network manager creates for this purpose is :
a. Network maintenance plan

8) An investment company has multiple servers that hold mission critical data. They are worried that if something happens to these servers, they will lose this valuable information. The type of plan that is needed for this company to help minimize loss in the event of a server crash is:
a. Business security

9) When searching for information about authentication methods and usernames of company personnel, a network administrator can look at :
a. Business Security Plan

10)

11) A network administrator needs to configure Telnet access to a router. Which group of commands enable Telnet access to the router :
a. Router(config)# enable password class
Router(config)# line vty 0 4
Router(config-line)# login
Router(config-line)# password cisco