Here are some of my installed packages. I don't know what was installed during jailbreak or what I installed later. ps, ping (which works for me), telnet, and the other things you're asking about are in these packages.
BigBoss Recommended Tools (I think this may install a lot of the rest of these), core utilities, core utilities (/bin) (I need to look into why I have both of those), inetutils, network-cmds, shell-cmds, system-cmds, basic-cmds, adv-cmds. Searching Cydia for cmds should bring all those last few up.
I also have top, unrar, unzip, wget, whois, sed, gzip, grep, bzip2 listed as separate packages, but I only remember installing half of them, so some must have came with the jailbreak.