Oct 9, 2020
Best CCNP Route with live online courses from College of Contract Management in the United Kingdom, gain qualifications worldwide.
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Best CCNP Route with live online courses from College of Contract Management in the United Kingdom, gain qualifications worldwide.
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استخدام کارشناس ارشد شبکه
دارای مدرک CCNP(Route-Switch)
مسلط به مجازی سازی
مسلط به سیستم های فایروال
آشنایی با میکروتیک
مسلط به سرویس های مایکروسافتی
مسلط به نرم افزارهای مانیتورینگ
شرکت ارتباط دادهها و فن آوران آسيا (آدفــــا) از سال 1382 فعاليت خود را آغاز نموده است تا با بهرهگيري از توانمنديهاي كادر مجرب، استفاده از تكنولوژيهاي نوين و بکار گيري دانش روز، به عنوان ارائه دهنده راه حلهاي جامع امنيت در حيطه تكنولوژي اطلاعات، تأمين كننده تجهيزات زيربنايي جهت ايجاد بسترهاي شبكه و ارائه خدمات وپشتيباني فني در راه پيشرفت اهداف سازمانها و موسسات در زمينههاي مختلف ICT به نحو شايسته اي فعاليت نمايد.
اطلاعات تماس
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With the growth far out THE VERY THING and craft worlds apart spheres of networking are mushrooming up.<\p>
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5 Hot Topics to Prepare for the CCNP Route Exam
Introduction: Good understanding order to prepare for the CCNP certification exam, the candidates should move familiar with a lot of networking technologies. Yours truly will be thoroughly tested on a number as respects these networking technologies in which time i myself bum around against the CCNP examination. The Networkers Guru hardening vital center professionals put forth a detailed overview of all the required technologies which are needed now clearing the said corroboratory evidence exam. A lot of candidates face many problems herein their preparation as things go the exam primarily now of the too long and overtechnical CCNP course. Oneself is true that they have to toast all excepting still there are some hot topics which can never be unwatched under any one full particulars. Following is a list touching those 5 topics within brief contents which can be extremely useful for complement prospective candidates seeking CCNP Certification: 1. EIGRP Advertised Distance and Feasible Distance - It is monistic of the hot topics that other self can ever come across in your CCNP fortification exam equipment. A lot respecting candidates and students of networking encounter a messuage of confoundment between the advertised distance and expedient impassivity concepts. Feasible haughtiness inflowing networking terms is the best direction while advertised purview is known considering the reported distance. For additional euhemerism and fitness of the topic, the candidates are advised to refer the mill run book or consult with some reputable inurement center such as the Networkers Educationist.<\p>
2. OSPF LSAs - Another ruling but spiny secondary plot way the CCNP examen is the OSPF LSAs which stands for Open Shortest Path Master Link-State Advertisements. The switch is not unique useful to prepare for the strengthening examination, but it is also crucial to understand the working of the devices in the pole areas and its of common source concepts. There are about 5 types in respect to Congregate State Advertisements which are worth preparing for your CCNA Exam.<\p>
3. OSPF Stub Areas - The topics of OSPF LSAs and OSPF stub areas are implicated to each other. The OSPF LSAs is a prerequisite headed for OSPF stub areas in order against get the better off understanding of both the topics. There are 3 types of OSPF stub areas which are the Stub Areas, Beyond measure Stubbed Areas and Not In like manner Stocky Areas. All these three types are very prestigious and the candidate should clearly distinguish between all these types. The candidates should refer in transit to their course books inwardly order so that get a deep unity of all these concepts.<\p>
4. Redistribution - Redistribution is a critical cross-question but the good phobia is that it is not too difficult. Redistribution concepts just out with that how against move one protocol alive in coalesce network to the other protocol, lemon-yellow in other words from unanalyzable OSPF circuit to the other OSPF network.<\p>
5. BGP Superb Path Electing - BGP stands for Border Gateway Understanding, which requires a single and the most optimum path upon be in existence named for inserting it into the routing table. The candidates should extensively prepare this topic by referring as far as their course article and other preparation material.<\p>
CCNP Route Presentation
[slideshare id=24878900]
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BGP counter reliance on ACL counters
BGP relies on the number of logs counted for a block rule in the ACL that is used for a prefix list to keep track of its counter. This means that anytime the ACL gets a deny hit it'll increment no matter what triggers it. So if a route flaps somewhere, it'll increment the counter each time it flaps (as long as it’s not within the time of a single BGP update).
Initial logs:
TestBranchR01#sh ip access-lists ALLOW1 Standard IP access list ALLOW1 10 permit 0.0.0.0 (1 match) 20 permit 10.96.0.0, wildcard bits 0.0.255.255 (2 matches) 30 deny any (140 matches)
Outbound Inbound Local Policy Denied Prefixes: -------- ------- route-map: 4 140 Suppressed due to dampening: 2 n/a Total: 6 140
Added 4 more routes to be blocked:
TestBranchR01#sh ip access-lists ALLOW1 Standard IP access list ALLOW1 10 permit 0.0.0.0 (1 match) 20 permit 10.96.0.0, wildcard bits 0.0.255.255 (2 matches) 30 deny any (144 matches)
Outbound Inbound Local Policy Denied Prefixes: -------- ------- route-map: 4 144 Suppressed due to dampening: 2 n/a Total: 6 144
I then removed the advertisement for the 4 routes, waited for the BGP process to cycle and re-added the same 4 routes
TestBranchR01#sh ip access-lists ALLOW1 Standard IP access list ALLOW1 10 permit 0.0.0.0 (1 match) 20 permit 10.96.0.0, wildcard bits 0.0.255.255 (2 matches) 30 deny any (148 matches)
Outbound Inbound Local Policy Denied Prefixes: -------- ------- route-map: 4 148 Suppressed due to dampening: 2 n/a Total: 6 148
This is not a bug within IOS it’s just how BGP handles the counters. A clearing of the ACL counters will not fix this problem either.
TestBranchR01#clear access-list counters ALLOW1
TestBranchR01#sh ip access-lists ALLOW1 Standard IP access list ALLOW1 10 permit 0.0.0.0 20 permit 10.96.0.0, wildcard bits 0.0.255.255 30 deny any Outbound Inbound Local Policy Denied Prefixes: -------- ------- route-map: 4 148 Suppressed due to dampening: 2 n/a Total: 6 148
After addition of same 4 routes again:
TestBranchR01#sh ip access-lists ALLOW1 Standard IP access list ALLOW1 10 permit 0.0.0.0 20 permit 10.96.0.0, wildcard bits 0.0.255.255 30 deny any (4 matches) Outbound Inbound Local Policy Denied Prefixes: -------- ------- route-map: 4 152 Suppressed due to dampening: 2 n/a Total: 6 152
I contacted Cisco about this and they said that it’s not affecting actual route advertisement and is not considered a bug. A reboot of the device will reset the blocked prefix count back to 0.
A PDF version can be found here.