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Studying Cisco Networks
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Tools
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This site lists only a few tools. For comprehensive listing of tools available check out these:

Network Monitoring Tools:

MRTG monitors the traffic load on network links.  It generates HTML pages containing graphical images which provide a live visual representation of this traffice.  Works under UNIX and Windows NT.  Find good support info here.
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Kiwi Syslog Daemon is a freeware Syslog Daemon for Windows. It receives, filters, logs, displays and forwards Syslog messages and SNMP traps from hosts such as routers, switches, Unix hosts and any other syslog enabled device.

Distributed Inetnet Traffic Generator (D-ITG)

The Distributed Internet Traffic Generator (D-ITG) is a platform capable to produce traffic (network, transport and application layer) and accurately replicate appropriate stochastic processes for both IDT (Inter Departure Time) and PS (Packet Size) random variables
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Nmap is a free open source utlity for network exploration or security auditing.  Nmap usues raw IP packets in novel ways to determine what hosts are available on the network, what services they are offering, what operating systems they are running, what type of packet filters/firewalls are in use and other characteristics.

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Monitors all business-critical processes in a server-based computing infrastructures.  Offers free EControl Portal Pilot License that monitors 10 services.

Supported tests include monitoring of SMTP, IMAP, HTTP, TCP, UDP, Radius, NNTP, POP3 servers.  Also includes the ability to ping hosts and routers and performs SNMP queries and generates alerts based on those results.
NetInfo analyzes Internet connection in order to isolate potential pitfalls. Uses tools like Local Info, Connections, Ping, Trace, Lookup, Finger, Whois, Daytime, Time, Quote, HTML, Scanner, Services, E-mail, and Web Center.
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Network Monitoring and SNMP management service for mixed windows and unix environments.
Nomad is a network mapping program designed to automatically discover a local network, using SNMP to identify network devices and work out how they are physically connected.  The network is then presented as a topology diagram with simple integrated monitoring.
30 day free evaluation trial versions available for various network management and discovery tools.  Also have free downloads of tftp server and subnet calculator.
Provides intrusion detection by checking whether files have been changed, added or deleted on a Windows 2000/XP system.  If this happens, it alerts the administrator by email.  Because hackers need to change a certain system files to gain access, this freeware utility provides a great means to identify any servers that are open to attack.
Checks your network for all potential methods that a hacker might use to attack your network. By analyzing the operating system and the applications running on your network, GFI LANguard N.S.S. identifies possible security holes.

Network Sniffers:

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EffeTech HTTP Sniffer is a HTTP packet sniffer, protocol analyzer and file reassembly software based on windows platform.  Free trial version available.

Network protocol analyzer for Unix and Windows.  It allows you to examine data from a live network or from a capture file on disk.  Ehereal has several powerful features, including a rich display filter language and the ability to view the ASCII contenes of a TCP connection.
Free (Windows/Linux) network monitor and protocol analyzer
 
WinDump is fully compatible with tcpdump and can be used to watch and diagnose network traffic according to various complex rules. It can run under Windows 95/98/ME, and under Windows NT/2000/XP. WinDump is free.

Calculators:

The Network Calculator includes the Hexpert Calculator (binary-decimal-hexadecimal base conversion), the IP Subnet Calculator (subnet/supernet address computation), and the Latency Calculator (latency calculation across multiple LANs and WANs) in one, convenient program.
The calculator generates a color-coded bit map, breaking down the network, subnet, and host portion. It shows you the subnet host address range, the subnet ID, and the subnet broadcast address. The binary representation and hexadecimal representations of IP addresses are supported.

Ping & Traceroute:

Perl script that allows you to remotely ping machine(s) from router(x) while sitting on box (a).
AnalogX HyperTrace is a GUI version of traceroute.  It displays each hop, machine name, response time, and the route TTL.

Misc:

Freeware tool for creating network diagrams with user definable management features such as point and click telnet.
Characterizes the bandwidth, latency, and loss of links along an end-to-end path through the internet.
Measures the real time speed of your internet connection.
Java applet will decode any HEX string using the ASN.1 standard.
KeyEx extracts all of the keywords off of a webpage and then sorts and indexes them based on their usage and position.
Tftpd32 includes DHCP, TFTP, SNTP and Syslog servers as well as a TFTP client.