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R&S Quick Notes – Security & IP Services
Wednesday, June 24th, 2009Security Know how to use extended access-lists in distribute-lists, see Brian McGahan @INE article. Know how to use extended access-lists instead of prefix-lists, see Brian Dennis @ INE article. Know your binary voodoo as Scott Morris @ INE calls it, Part I & Part II. Dont forget to allow IGP’s, BGP, Multicast , IPv6 and [...]
R&S Quick Notes – QOS
Wednesday, June 24th, 2009QOS Class class-default need “fair-queue” if “bandwidth” was not specified. When using “ip rsvp bandwidth” on a sub-interfaces, it is also required to be configured on the main interface. When using multiple sub-interfaces with “ip rsvp bandwidth”, the main interface should be configured to be the sum all sub-interfaces. RSVP requires fair-queue to be enabled. [...]
R&S Quick Notes – Multicast & IPv6
Tuesday, June 23rd, 2009Multicast BSR is also commonly referred to as PIMv2. Pay special attention to when using Frame-Relay non-broadcast types. Multicast will not work. Tunnels might be needed. BSR – when multiple c-RP announces same groups, a longer match will be used to determine the RP, regardless of the RP priority set. With TTL scoping, if the [...]
R&S Quick Notes – BGP
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R&S Quick Notes – IGP’s
Friday, June 12th, 2009RIP Know your filters: Offset-list, Distribute-lists, distance command. With filters read carefully: “between 25 & 45″ or “from 25 to 45″. Know your prefix-lists or alternatively using ACL’s instead. “passive interface” command, ONLY stops the sending of updates out the interface. Interface will still receive and process those updates. Passive interfaces will still be advertised [...]
R&S Quick Notes – Frame-Relay/PPP
Monday, June 8th, 2009Frame-Relay DHCP on a frame interface : “frame-relay interface-dlci 555 protocol ip 166.166.166.2″ When asked to disable INARP, be sure to do so on physical interfaces any multipoint sub-interfaces. If you see 0.0.0.0 frame mappings, save your config and reload. The backup command can NOT be used on FR physical interfaces. (no way to detect [...]
R&S Quick Notes – Switching
Friday, June 5th, 2009With the insane amount of theory to go through before the big day comes, it is only normal for a couple of items to get lost in the masses. On top of that, regardless of the material you used to study, you are bound to come across a couple small things that you have not [...]
CCNA Quick Notes – Routing
Friday, April 3rd, 20091.How do OSPF-enabled routers build adjacencies and exchange their routing tables? OSPF-enabled routers build adjacencies by sending Hello packets out through all OSPF-enabled interfaces. If these routers share a command link and agree on parameters set within their Hello packets then they become neighbors. If these parameters differ then the routers do not become neighbors [...]
CCNA Quick Notes – Internetworking
Friday, April 3rd, 20091.What are the three layers of the Cisco Hierarchical Model? The three layers of the Cisco Hierarchical Model are:1 The access layer The distribution layer The core layer 2.In the Cisco Hierarchical Model, what is the function of the access layer? Sometimes referred to as the desktop layer, the access layer is the point at [...]