[2011-12-06] New animation tutorials: FTP, WWW. Audio enabled.
[2011-10-21] OSPF Concetps: Architecture, why, flow. (15 animations)
[2011-09-08] Routing animations for beginners (audio)
[2011-07-21] Multilayer switching animation released (CCNP)
[2011-07-05] CCNP Switching Security
[2011-05-17]
[2011-04-28]
[2011-04-09]
[2011-03-24]

• [2011-12-06] New animation tutorials: FTP, WWW. Audio enabled.

  11 FTP animation tutorials answer following questions:

  • What are control and data connection?
  • How do FTP commands, connections, and return codes interact?
  • How does FTP react to link down and up?
  • Can FTP server brings up a connection across a gateway with NAT?

  
  4 WWW animation tutorials to answer following questions:

  • What's the structure of  url?  Ho to use it ?
  • How can HTTP fetch web pages?
  • How to use HTML  to build web pages?
• [2011-10-21] OSPF Concetps: Architecture, why, flow. (15 animations)

  Beginners may find traditional OSPF materials are either too broad or too detailed. This OSPF concept series is focused:on helping beginners grasp key system concepts quickly. It answers the following questions:

  • How is OSPF superior to RIP?
  • Why do we need 7 LSAs？What do they do?
  • How does OSPF treat interior routers?
  • How does SPF use Router LSA to calculate shortest path?

  See more at OSPF Concept overview.  All animations are audio empowered. Click the Audio button at upper left.

• [2011-09-08] Routing animations for beginners (audio)

  
  In our first questionnaire sent in August, we received good feedback from many beginners. They ask:

  • Do I need to know something about networking in order to read your animations?
  • Can you provide animations for real beginners? I never saw a router.

  We've been working on it and just published 9 animations to answer the following questions:

  1. How does Internet forward messages?
  2. How does internet use router to forward message?
  3. What is routing path?
  4. How to route with IP address?
  5. How to route with network address?
  6. What is network address and how is it related to IP address?
  7. What is static route?
  8. How does default route works?
  9. What do we need default route?

  Note: To listen audio, click Voice tab at the upper left corner (above thumbnails)

• [2011-07-21] Multilayer switching animation released (CCNP)
  1. VLAN routing- One arm router.  How to route packets across VLAN without multilayer switches?
  2. Multilayer switchng basics    Visualize "Route Once, Switch Many" with a router engine blade inserted in a switch.
  3. CEF - Cisco Express Forwarding Visualizie how CEF uses FIB and Adjacency to switch packets at line rate.
  4. Layer-3 switching  (Dynamips lab)   Visualize simulation result of a Layer 3 switching scenario: CAM, routing table, ARP cache, SVI, virtual MAC.
• [2011-07-05] CCNP Switching Security

  CCNP Switching Security:  Just released 12  animaations.

  1. Port secuirty:
  2. DHCP DOS Attack  
  3. DHCP Snooping  
  4. ARP Inspection
  5. IP Source Guard 

  5.1 IP Spoofing  
  5.2 IP Source Guard- IP Spoofing
  5.3 Man In The Middle
  5.4 IP SOurce Guard- Man In The Middle 
  5.5 IP Source Guard- Static IP  

       6. Private VLAN 
       7. VLAN ACL  
       8. VLAN Hopping

• [2011-05-17]

  New Release: CCNP Path Control. 7 animations [2011.5.17]

  1. Redistribute route       How to use "Redistribute" to advertise subnets to a different routing domain.
  2. Distribute list filtering  Redistribute may produce bad routes that need to be filtered. One way is to use distribure list.
  3. Route map filterring     The other way to filter redistributed routes is route map.
  4. Prefix-list filtering                Use prefix-list to filter a block of consective addresses.
  5. Administrative distance     If redistribute produces suboptimal routes, use AD to fix it.
  6. Policy-basred routing (PBR) If two nodes are connected by parallel links with differnt speed, only one link is selected. The other is idle. Use PBR to fix it.
  7. IP SLA - floating static route  Use IP SLA and floating static route to switch to backup route automatically when the main path fails.
• [2011-04-28]

  Just published 8 CCNA RIP animations [2011.4.28]

  1. RIP configuration  Configure RIP. Compare routing table with topology.
  2. Passive interface  Configure router interfaces to disable RIP packet transmission.
  3. Subnet mask in RIPv1  RIPv1 does not know subnet mask. But if an interface's mask is changed, routes in routng table can also change.
  4. RIPv2 configuration  See how to configure RIP to advertise classless subnets
  5. RIPv2 manual summary  Configure RIP route summary.
  6. Triggered update  Show how to flood routes when topology changes
  7. Float static route  Configure a statuc route as a backup route. 
  8. IP defauly network  Advertise external routes as a default route to other RIP routers.
• [2011-04-09]

  CCNA OSPF tutorial animation (11) just released.  [2011.4.9]
  Use animation to illustate the cause-effect relationships of topology, configuration commands, and show output. Once the beginners get the key point in a few minutes, taking classes or reading CCNA books become much easier.

  1. OSPF basic configuration. How to configure OSPF (router ID, network address, area) and verify (route, LSA.)
  2. Broadcasr DR.                     Configuration routers (priority, Router ID) and verify election results (DR, BDR, DROTHER).
  3. Simple authetication      .   
  4. MD5 authentication       
  5. Defaul-info originate      Configure an ASBR as a the default gateway for OSPF routers (use a default route 0.0.0.0.)
  6. Area Border Router        Configure ABR routers and verify results (route, LSA type).
  7. Manual summary            Configure ASBR (range, summary-address) to summarize external addresses..       
  8. Stub area                          Configure a stub area and observe its effects on interior routers (default route 0.0.0.0)
  9. NSSA                                 Configure a NSSA when a router in a stub atea has external addresses to share.
  10. Virtual link - broken area 0   Use virtual link to join physically separated Area 0s.
  11. Virtual link - remote area     Use virtual link to connect a remote area to Area 0.
• [2011-03-24]

  HSRP labs are updateed: Animate dynamips simulation lab with color packets and state tables. [2011.3.22]

  • 2. RFC2281 state table. Animate HSRP's RFC state table to show how to look uo state changes.
  • 3. Election lab. Animation a dynamips-based lab to show detail steps of HSRP election (packets, states)
  • 4. Link down lab. Animate a dynamips-based lab to show how HSRP recovers from link dow  (Timer, state, action)
  • 5. HSRP-OSPFink down-1. Routers are running HSRP and OSPF (dynamips). Link down triggers protocol transition. 3 ping are lost. One loss is due to HSRP convergence timing. 20 critical packets are colored (out of 300) to show the ripple effect of link down..
  • 6. HSRP-OSPF link down-2. Repeat the previius lab. But one ping loss is caused by OSPF synchronization timing.