Many have been spreading rumors about the newest version of the CCIE R&S lab exam. Those rumors were validated as Cisco announced their latest revision of the R&S exam to replace the current v4.0 within the next 6 months. You can read about it here: https://learningnetwork.cisco.com/docs/DOC-22703 and watch the video introduction below.
Archives for 2013
Using Twitter to study for you CCIE is not far fetched. I did it. I know a number of people who have as well. Here’s what you need to do.
First create a Twitter Account if you don’t already have one.
Next, search for the hash tag CCIE, as seen below.
Now follow people who come up in that search. Look for those who post frequently. Businesses are ok to follow, but look at their posts. If it’s all marketing and nothing relevant I would skip it for now. I showed up #14 in my search. That’s not too bad eh?
Finally, try to interact with them. They’re mostly nice people and are usually willing to help out with questions that are genuine.
Here are a few people I recommend following:
- Ron Fuller <– Fellow Cisco Press Author.
- Scott Morris <– Makes a mean cinnamon apple moonshine!
- Tom Hollingsworth <– All around great guy.
- Brent Salisbury <– Care to learn about SDN? This is the guy!
- Me of course!
- Blake Krone <– Blake is a Wireless Guru!
- Jeff Fry <– Jeff has been doing some juniper stuff lately you might be interested in.
- Joe Astorino <– R&S is his specialty. Joe is another great guy that likes to help people learn.
Honestly there are so many more I could list, but if you’re resourceful you can figure it out.
By default, all non-modular Cisco Catalyst switches running IOS have all ports enabled as layer2 ports with DTP (Dynamic Trunking Protocol) enabled. The only exception here is for switches which have a dedicated out-of-band management port, this being a layer3 port, which cannot be converted to layer2. Dynamic Trunking Protocol is a protocol that allows two switches to negotiate the interconnecting links as trunk, and negotiates the trunking protocol used between then. The trunking protocol can be 802.1q or ISL, with ISL having priority over 802.1Q. With DTP there is no required configuration. It just happens. It looks like magic, but it’s not.
Depending on the switch you use there are two possible default port states:
- Dynamic Desirable (DTP Active), which means the port actively sends DTP messages, thus it initiates trunk formation.
- Dynamic Auto (DTP Passive), which means the port sits back and waits for DTP messages from the other end. It doesn’t respond and finalize the trunk formation until it’s initiated by the other side.
If you connected two switches which default is to have the ports in Dynamic Auto mode, as is the case for Catalyst 3750-X, no trunk will be formed as neither switch will initiate the DTP negotiation. This is why it’s common in trunk port configurations to specify the trunking protocol and administratively set the port as trunk. This ensures trunking will take place as desired. To configure trunking use the following commands:
switchport trunk encapsulation dot1q switchport mode trunk
Ports administratively configured as trunks still have DTP enabled, while ports administratively configured as access have DTP disabled. The command to disable DTP statically is switchport nonegotiate. Using this command makes it visible in the configuration, however when configuring an access port, the switchport mode access command is what disables DTP.
If you’re just starting out with the Cisco ASA you’re in luck! The Cisco ASA has command modes that are very similar to that of a Cisco Router or Switch. In fact, you’re going probably enjoy some of the features that you’ll learn on the CLI that you can’t do on other devices. Let’s explore some of the ASA command modes.
The Cisco ASA has a ROM Monitor mode similar to that of the routers. You can use this mode to load a new OS or perform a password recovery. To access this mode hit the escape character when prompted during boot time.
User EXEC Mode
User EXEC mode is similar to that of user EXEC on a router or a switch. You’re limited in the commands you can enter, and you need to get into privileged EXEC to get anything worthwhile done. To move from user EXEC to privilege exec use the enable command. When prompted for a password, by default, you simply hit enter.
Privilege EXEC Mode
Privilege EXEC mode is the mode that allows you privilege access to the configuration commands. From this mode you can view the running and startup configuration files, you can move into global configuration mode and make administrative changes. To move from this mode to configuration mode enter the configure terminal command.
Configuration mode allows access to the interfaces and routing processes as well as all the global commands that apply to the device as a whole. What you’ll really appreciate in this mode is that you can enter show commands just as you would from privilege EXEC mode. To move from this mode to interface configuration mode enter the interface interface_type x/x command. To move from configuration mode to router configuration mode enter the router protocol option command.
Interface Configuration Mode
In interface configuration mode you can apply addresses to interfaces, bring the interface up, and apply other configuration parameters that apply to the specific interface that you have accessed. Like configuration mode you can also issue show commands in this mode.
Router Configuration Mode
Router configuration mode is where you will configure parameters pertaining to you routing protocol of choice. The Cisco ASA supports RIPv2, OSPF, and EIGRP. Like configuration mode you can also issue show commands in this mode.