This post will look over some areas I think will be easy wins for the JNCIS-ENT Exame.
IEEE Standards: Link to heading
- 802.1D - Spanning Tree
- 802.1w - Rapid Spanning Tree (w = wapid)
- 802.1ad - LACP
IP Protocols: Link to heading
- 6 - TCP
- Port 179 - BGP
- 89 - OSPF
- 124 - IS-IS over IP
Preferred Preferences: Link to heading
STP Bridge Prority - Lower Routing Preference - lower OSPF DIR priority/RID - Higher IS-IS DIS priority - Higher? BGP local pref - Higher
Default TTLs: Link to heading
iBGP TTL - 255 eBGP TTL - 1 VRRP TTL - 255?
Random Bits: Link to heading
Ethernet switching - Learning, Forwarding, Filtering, Flooding, Aging
STP States - Blocking, Listening, Learning, Forwarding RSTP States - Discarding, Learning, Forwarding
Routing Preferences: Link to heading
| Route Protocol/Source | Default Preference | Statement to Modify Default Preference |
|---|---|---|
| Directly connected network | 0 | – |
| System routes | 4 | – |
| Static and Static LSPs | 5 | static |
| Static LSPs | 6 | – |
| OSPF internal route | 10 | OSPF |
| IS-IS Level 1 Internal Router | 15 | IS-IS |
| IS-IS Level 2 Internal Router | 18 | IS-IS |
| RIP / RIPng | 100 | RIP |
| PIM | 105 | “Multicast Protocols Feature Guide” |
| Aggregate | 130 | aggregate |
| Generated | 130 | Generated |
| OSPF AS external routes | 150 | OSPF external-preference |
| IS-IS Level 1 External Router | 160 | IS-IS |
| IS-IS Level 2 External Router | 165 | IS-IS |
| BGP (EBGP/IBGP) | 170 | BGP preference, export, import |