- Which of the following is a key function in the cisco ios (internetwork operating system)? upgrade#
- Which of the following is a key function in the cisco ios (internetwork operating system)? software#
special functionality train, needs to be documented The B - broadband train, support internet based broadband features. The E - Enterprise train, is customized for implementation in enterprise environments. The S - Service Provider train, runs only on the company's core router products and is heavily customized for Service Provider customers. (In releases prior to Cisco IOS Release 12.0, the P train served as the Technology train.) Cisco doesn't recommend usage of T train in production environments unless there is urgency to implement a certain T train's new IOS feature. The T - Technology train, gets new features and bug fixes throughout its life, and is therefore potentially less stable than the mainline. Therefore, to determine the features available in a particular mainline release, look at the previous T train release. The previous technology train becomes the source for the current mainline train - for example, the 12.1T train becomes the basis for the 12.2 mainline. Updates are released only to address bugs in the product. The mainline train is designed to be the most stable release the company can offer, and its feature set never expands during its lifetime. Trains more or less map onto distinct markets or groups of customers that Cisco is targeting. Cisco recommend upgrading to Maintenance releases where possible, over Interim and Rebuild releases.Ĭisco IOS releases are split into several "trains", each containing a different set of features. Maintenance releases - Rigorously tested releases that are made available and include enhancements and bug fixes. The Cisco advisory web site may list more than one possible interim to fix an associated issue (the reason for this is unknown to the general public). Interim releases - Are usually produced on a weekly basis, and form a roll-up of current development effort.
Which of the following is a key function in the cisco ios (internetwork operating system)? upgrade#
Rebuilds are produced to either quickly repair a defect, or to satisfy customers who do not want to upgrade to a later major revision because they may be running critical infrastructure on their devices, and hence prefer to minimise change and risk. For example, 12.1(8)E14 is a Rebuild, the 14 denoting the 14th rebuild of 12.1(8)E.
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Rebuilds - Often a rebuild is compiled to fix a single specific problem or vulnerability for a given IOS version. Through the CLI, the commands available to each privilege level can be defined.Ĭisco IOS is versioned using three numbers and some letters, in the general form a.b(c.d)e, where:Ĭ is the release number, which begins at one and increments as new releases in the same a.b train are released.ĭ (omitted from general releases) is the interim build number.Į (zero, one or two letters) is the release train identifier, such as none (which designates the mainline, see below), T (for Technology), E (for Enterprise), S (for Service provider), XA as a special functionality train, XB as a different special functionality train, etc. All commands are assigned a privilege level, from 0 to 15, and can only be accessed by users with the necessary privilege. "Global configuration mode" provides commands to change the system's configuration, and "interface configuration mode" provides commands to change the configuration of a specific interface. The IOS CLI provides a fixed set of multiple-word commands - the set available is determined by the "mode" and the privilege level of the current user. (Earlier switches ran CatOS.) IOS is a package of routing, switching, internetworking and telecommunications functions tightly integrated with a multitasking operating system.
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Which of the following is a key function in the cisco ios (internetwork operating system)? software#
Cisco IOS (originally Internetwork Operating System) is the software used on the vast majority of Cisco Systems routers and current Cisco network switches.