BGP Interview questions and answers are shared here. In this post, we will look at some of the important BGP questions that are asked in the Interviews and some of the certification exams. You can consider this as a BGP Quiz and test your BGP knowledge.
A. It is used for the reachability between PE devices in the MPLS network
B. It is used to carry EBGP prefixes inside an Autonomous System
C. It is used with Route Reflectors for the scalability reason in large scale networks
D. It is used to prevent failures outside your network from impacting your internal network operation
Answer: One of the correct answers to this question is to carry EBGP prefixes inside an Autonomous system. IGP is used for the reachability between PE devices in an MPLS network. Option C is valid but not the correct answer, because; the question is asking about the reasons, not the best practices.
Option D is one of the correct answers as well because, with IBGP, the internal network is protected from outside failures by separating the local failure domains.
That’s why; the answers to Continue reading
Jeff Tantsura left me tantalizing hint after reading the BGP Labeled Unicast on Cisco IOS blog post:
Read carefully “Relationship between SAFI-4 and SAFI-1 Routes” section in RFC 8277
The start of that section doesn’t look promising (and it gets worse):
It is possible that a BGP speaker will receive both a SAFI-11 route for prefix P and a SAFI-42 route for prefix P. Different implementations treat this situation in different ways.
Now for the details:
Jeff Tantsura left me tantalizing hint after reading the BGP Labeled Unicast on Cisco IOS blog post:
Read carefully “Relationship between SAFI-4 and SAFI-1 Routes” section in RFC 8277
The start of that section doesn’t look promising (and it gets worse):
It is possible that a BGP speaker will receive both a SAFI-11 route for prefix P and a SAFI-42 route for prefix P. Different implementations treat this situation in different ways.
Now for the details:
Today on the Tech Bytes podcast we’re talking about disaggregated optical networks and what they mean for both customers and carriers when it comes to issues such as service delivery and cost. Our sponsor is Arelion.
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This post originally appeared on the Packet Pushers’ Ignition site on April 16, 2021. We’ve explored the various filesystems on Cisco devices, but you may have wondered how we get new files onto our devices. How do we backup files from our devices? This article explains copying files to and from a Cisco device. Additionally, […]
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In this post, some of the frequently asked OSPF questions will be answered. Some of the answers will be from a design point of view and we will try to provide enough justification for the answer. Questions are selected randomly, not based on the order of importance.
We don’t give any numerical number as an answer to this question. Depending on the number of routers, links, prefixes, and the topology of the network also depends on the hardware capabilities and the performance of the routers, the number change from Network to network. In some networks, you can place only a couple of hundreds, and in some networks, you can place thousands of Routers in a single OSPF Area.
On Cisco devices, sh ip route ospf is used to see only the OSPF routes in the routing table.
The first preference for an OSPF router ID is an explicitly configured 32-bit address. This address is not included in the routing table and is not Continue reading
At the most basic level, there are only three BGP policies: pushing traffic through a specific exit point; pulling traffic through a specific entry point; preventing a remote AS (more than one AS hop away) from transiting your AS to reach a specific destination. In this series I’m going to discuss different reasons for these kinds of policies, and different ways to implement them in interdomain BGP.
In this post, I’ll cover the first of a few ways to give surrounding autonomous systems a hint about where traffic should enter a network. Note this is one of the most vexing problems in BGP policy, so there will be a lot of notes across the next several posts about why some solutions don’t work all that well, or when they will and won’t work.
There are at least three reasons an operator may want to control the point at which traffic enters their network, including: