The best replacement for cisco is juniper.

The best alternatives to cisco are rated as following:
★★★★★  juniper
★★★★★  avaya
★★★  microsoft
★★  hp
★★  shoretel
★★  aruba
★★  netgear
★★  nortel
★  huawei
★  brocade
★  sonicwall
★  microsoft certification
★  3com
★  arista
★  hp switches
★  linksys
★  mcse
  refugio
  comptia
  polycom
  sysco
  ruckus
  palo alto
  d-link
  checkpoint
  juniper certification
  mitel
  f5
  microsoft certification which is better
  genesys
  vmware
  lync
  juniper commands
  foundry
  msce
  avaya voip
  extreme
  ibm
  hirschmann
  netgear routers
  whitefish
  belkin
  meru
  fortinet
  riverbed
  cisco
  alcatel

Your alternative for cisco is not listed? Suggest!
Speaking about cisco, one probably shouldn't forget about pppoe.

Other search terms related to cisco and their ratings are:
★★★★★ pppoe
★★★★ nat
★★★★ freeradius
You have in mind a companion for cisco and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cisco in all years. Click on graph for more.
cisco
juniper
avaya