All 141 questions
How does BGP prevent routing loops?
Asked in 4 of 337 interviews · last asked Sep 29 · Concept · Mid-level
Show answer
BGP normally rejects a route if its AS_PATH contains the local AS number. Within an AS, iBGP does not advertise routes learned from one iBGP peer to another by default. Route reflectors relax this rule and use ORIGINATOR_ID and CLUSTER_LIST to prevent loops.
- eBGP normally adds the local AS number to AS_PATH when advertising a route; iBGP does not.
- Without route reflectors or confederations, iBGP needs a full mesh of peer connections.
- Route reflectors reject routes with their own router ID as ORIGINATOR_ID or their cluster ID in CLUSTER_LIST.
- When redistributing between OSPF and BGP, use route tags and filters to prevent routes feeding back.
What the interviewer checks: The interviewer checks whether you understand both AS-level loop detection and loop prevention within iBGP.
Other ways it was asked
- “How does iBGP prevent routing loops, apart from checking the AS path?”
- “What mechanism does BGP use to prevent routing loops?”
- “How would you prevent routing loops in a network running OSPF and BGP?”
Which BGP attributes can you use to influence outbound traffic routing?
Asked in 4 of 337 interviews · last asked Jul 31 · Concept · Mid-level
Show answer
Use LOCAL_PREF to choose the preferred outbound link across your AS. On Cisco routers, weight can override that choice on one router only. For inbound traffic, use AS_PATH prepending, MED, or provider-supported BGP communities. These influence how other networks reach you, but their routing policies can override your preferences.
- Higher LOCAL_PREF wins and applies across your AS.
- Higher Cisco weight wins before LOCAL_PREF, but affects only the local router.
- AS_PATH prepending makes an advertised path longer and usually less attractive.
- Lower MED is preferred, but it is normally compared only between routes from the same neighboring AS.
What the interviewer checks: The interviewer checks whether you distinguish outbound route control from inbound influence and understand each attribute’s scope.
Other ways it was asked
- “Which BGP attributes can you use to influence inbound traffic routing?”
- “Which BGP attributes can you use to manipulate route selection?”
- “What BGP options can you use to influence route selection for inbound versus outbound traffic?”
Can you explain BGP?
Asked in 4 of 337 interviews · last asked Aug 19 · Concept · Junior
Show answer
BGP (Border Gateway Protocol) is a path-vector routing protocol that exchanges routes between autonomous systems, such as ISP networks. It advertises IP address ranges and selects routes using policies and path attributes, not just distance. It is used for Internet routing and connecting a network to multiple providers.
- An autonomous system is a network or group of networks under one routing administration.
- eBGP exchanges routes between autonomous systems; iBGP shares BGP routes within one autonomous system.
- BGP peers establish connections using TCP port 179.
- The AS_PATH attribute lists autonomous systems along a route and helps prevent routing loops.
What the interviewer checks: The interviewer checks whether you understand BGP’s role in Internet routing and its policy-based route selection.
Other ways it was asked
- “What is BGP, and when would you use it?”
- “How does BGP work?”
- “What is BGP?”
What is the administrative distance of external BGP (eBGP)?
Asked in 3 of 337 interviews · last asked Apr 24 · Concept · Junior
Other ways it was asked
- “What is the administrative distance of internal BGP (iBGP)?”
- “What is the administrative distance of eBGP?”
- “What is the administrative distance for external EIGRP?”
What is the difference between static and dynamic routing?
Asked in 3 of 337 interviews · last asked Aug 4 · Concept · Junior
Other ways it was asked
- “Would you prefer static or dynamic routing?”
- “How does dynamic routing work, and when would you use it?”
What are BGP communities, and how are they used to influence routing policy?
Asked in 2 of 337 interviews · last asked Apr 7 · Concept · Mid-level
Other ways it was asked
- “What are BGP communities, and how are they used?”
How would you configure BGP to prefer a primary ISP and fail over to a secondary ISP?
Asked in 2 of 337 interviews · last asked Apr 27 · Scenario · Mid-level
Other ways it was asked
- “You have an internet router in your data center with BGP configured to AT&T and Verizon. How would you configure BGP so traffic from inside your company prefers the AT&T circuit to reach the internet, using Verizon only as a backup?”
- “How would you configure BGP on an internet router to prefer the AT&T circuit for outbound traffic, with Verizon as a backup?”
- “How would you configure BGP so inbound internet traffic prefers the Verizon circuit and uses AT&T as a backup?”
When would you choose BGP over OSPF, and what benefits does it offer?
Asked in 2 of 337 interviews · last asked Aug 4 · Scenario · Senior
Other ways it was asked
- “When would you use OSPF or BGP?”
- “When would you use BGP over OSPF, and why?”
- “What are the potential benefits of BGP compared with OSPF?”
What are the OSPF external route types E1 and E2, and what is the difference between them?
Asked in 2 of 337 interviews · last asked Apr 24 · Concept · Mid-level
Other ways it was asked
- “What is the difference between OSPF external route types E1 and E2, and which one is the default?”
If you redistribute routes between BGP and OSPF, how would you prevent routing loops, such as routes learned from OSPF being sent back into OSPF through BGP?
Asked in 2 of 337 interviews · last asked Jun 11 · Scenario · Senior
Other ways it was asked
- “When redistributing routes, how do you prevent routing loops?”
- “How can route maps be used to prevent routing loops during route redistribution?”
How does the OMP protocol work in Cisco SD-WAN?
Asked in 2 of 337 interviews · last asked Apr 24 · Concept · Mid-level
Other ways it was asked
- “What is OMP in Cisco SD-WAN, and what role does it play?”
If a router has the same /24 route learned through OSPF and BGP, which route is preferred?
Asked in 2 of 337 interviews · last asked Mar 6 · Concept · Mid-level
Other ways it was asked
- “If a router has three equal routes to 10.0.0.0/24—one learned through eBGP, one through OSPF, and one through iBGP—which route will it prefer?”
How would you improve failure detection and convergence in BGP and OSPF?
Asked in 2 of 337 interviews · last asked Aug 4 · Concept · Senior
Other ways it was asked
- “What configuration changes would you make to help BGP and OSPF detect link failures quickly?”
- “Can BGP convergence be sped up to approach OSPF convergence?”
- “How can you improve convergence and failure detection speed in OSPF or BGP?”
What is QoS, and how is it used?
Asked in 2 of 337 interviews · last asked Aug 4 · Concept · Junior
Other ways it was asked
- “What is quality of service (QoS), and when would you use it on a network?”
- “How is QoS typically implemented?”
What is OSPF?
Asked in 2 of 337 interviews · last asked Sep 17 · Concept · Junior
Other ways it was asked
- “What is OSPF, and what are its defining characteristics?”
What is the administrative distance of OSPF?
Asked in 2 of 337 interviews · last asked Mar 6 · Concept · Junior
What is MPLS?
Asked in 2 of 337 interviews · last asked Aug 4 · Concept · Junior
What purpose do routing protocols serve?
Asked in 2 of 337 interviews · last asked Aug 4 · Concept · Junior
Other ways it was asked
- “What is the purpose of network routing?”
How does your strongest routing protocol work, and how would you troubleshoot it?
Asked once · last asked Mar 12 · Scenario · Mid-level
What are the OSPF LSA types, and when is each used?
Asked once · last asked Apr 24 · Concept · Mid-level
Other ways it was asked
- “What is the difference between OSPF LSA types?”
How would you use BGP to prioritize link A and design failover to link B within 200 milliseconds?
Asked once · last asked Sep 17 · Design · Senior
Other ways it was asked
- “How would you achieve failover from link A to link B within 200 milliseconds?”
What technology can detect a BGP neighbor failure within 200 milliseconds when the usual hold time is about 30 seconds?
Asked once · last asked Sep 17 · Concept · Senior
Other ways it was asked
- “What technology can detect a BGP neighbor failure within about 200 milliseconds without relying on the default hold time?”
What is the difference between MED and local preference?
Asked once · last asked Feb 24 · Concept · Mid-level
What is the difference between OSPF LSA Type 3 and Type 5?
Asked once · last asked Feb 24 · Concept · Mid-level
What common issues can occur with BGP and OSPF, and how would you troubleshoot them?
Asked once · last asked Feb 24 · Scenario · Mid-level
How do you perform route redistribution between BGP and OSPF?
Asked once · last asked Feb 24 · Tooling · Mid-level
Suppose you have two data centers experiencing latency issues and both routers use BGP. How would you start troubleshooting?
Asked once · last asked Feb 24 · Scenario · Senior
What does the BGP replace-as command do?
Asked once · last asked Feb 27 · Concept · Mid-level
What is the difference between the BGP local preference and weight attributes?
Asked once · last asked Feb 27 · Concept · Mid-level
How does local preference work?
Asked once · last asked Feb 27 · Concept · Mid-level
What is an LSA type 7 in OSPF?
Asked once · last asked Feb 27 · Concept · Mid-level
Other ways it was asked
- “In what scenario is an OSPF type 7 LSA needed?”
Do all OSPF areas need to connect to area 0?
Asked once · last asked Feb 27 · Concept · Mid-level
How can you use the show ip route command to view OSPF routes?
Asked once · last asked Feb 27 · Tooling · Junior
With an OSPF E2 route, if there is one external route but multiple paths to reach it, is the internal cost used?
Asked once · last asked Feb 27 · Concept · Senior
What mechanisms can you configure to control which routes are advertised, or which metrics are injected, when redistributing between routing protocols?
Asked once · last asked Mar 6 · Tooling · Senior
Can you walk me through the commands to establish a BGP adjacency between two directly connected switches in different autonomous systems?
Asked once · last asked Mar 6 · Tooling · Mid-level
What command would you use to verify that the BGP adjacency has been established?
Asked once · last asked Mar 6 · Tooling · Junior
How would you check which routes you’re advertising from one switch to a BGP neighbor?
Asked once · last asked Mar 6 · Tooling · Mid-level
In a brief pitch, what benefits does SD-WAN offer compared with traditional routing?
Asked once · last asked Mar 6 · Concept · Mid-level
If you have two OSPF links, one primary and one secondary, and the primary link is up but experiencing problems, how can you fail over traffic to the secondary without shutting down the interface?
Asked once · last asked Mar 6 · Scenario · Senior
What is an OSPF passive interface, and when would you use one?
Asked once · last asked Mar 6 · Concept · Mid-level
With BGP, how would you prefer a primary link over a secondary link, and which parameters would you use for incoming versus outgoing traffic?
Asked once · last asked Mar 6 · Scenario · Senior
Why might an iBGP router fail to receive a route advertised by another router?
Asked once · last asked Mar 11 · Scenario · Mid-level
How would you achieve BGP route propagation without a route reflector?
Asked once · last asked Mar 11 · Concept · Mid-level
How would you use BGP to influence inbound traffic from an ISP?
Asked once · last asked Mar 11 · Scenario · Senior
Can you use more-specific prefixes to influence inbound traffic without changing BGP metrics?
Asked once · last asked Mar 11 · Concept · Senior
How would you configure ISP failover so ISP 1 becomes active if ISP 2 goes down, without changing metrics?
Asked once · last asked Mar 11 · Scenario · Senior
How can you load-balance traffic using iBGP and eBGP, including active load balancing between two ISPs?
Asked once · last asked Mar 11 · Scenario · Senior
What are the implications of configuring the bandwidth command on an interface, and where can it be used?
Asked once · last asked Mar 20 · Concept · Mid-level
How does a routing protocol use the bandwidth value configured on an interface?
Asked once · last asked Mar 20 · Concept · Mid-level
Besides influencing routing-protocol metrics, what other effects can the interface bandwidth command have?
Asked once · last asked Mar 20 · Concept · Mid-level
What does the AS path attribute represent in BGP?
Asked once · last asked Mar 20 · Concept · Mid-level
Are there ways to work around the iBGP split-horizon limitation and expand an iBGP network beyond a few nodes?
Asked once · last asked Mar 20 · Concept · Senior
Is there a limitation or drawback to implementing a route reflector?
Asked once · last asked Mar 20 · Concept · Senior
How is BGP used in an internal WAN versus an Internet-facing network?
Asked once · last asked Mar 23 · Concept · Mid-level
How is BGP used to connect to multiple ISPs in a multihomed network?
Asked once · last asked Mar 23 · Concept · Senior
How would you implement QoS for video traffic?
Asked once · last asked Apr 6 · Scenario · Mid-level
Suppose two sites, A and B, both use AS 4500 and are connected through a transit network. When site A communicates with site B, how are the routes installed, and will communication work?
Asked once · last asked Apr 7 · Scenario · Senior
When two sites use the same autonomous system number, what methods can you use to allow their routes to be installed in your routing table?
Asked once · last asked Apr 7 · Scenario · Senior
Where is the autonomous system override configured: on the client or customer edge, or in the transit layer?
Asked once · last asked Apr 7 · Concept · Senior
Can you explain the difference between BGP and MP-BGP?
Asked once · last asked Apr 7 · Concept · Mid-level
What problems can enterprises encounter when using iBGP, and how does eBGP mitigate them?
Asked once · last asked Apr 7 · Concept · Senior
With 20 branch offices and one data center, would you use a full mesh or a route reflector, and why?
Asked once · last asked Apr 7 · Design · Senior
Does BGP require an IGP alongside it, or can it operate on its own?
Asked once · last asked Apr 7 · Concept · Mid-level
From a design perspective, what problems does static routing create, and why would you choose dynamic routing instead at scale?
Asked once · last asked Apr 7 · Concept · Senior
If a BGP peer is established but the expected prefix is not in the routing table, what could be the problem and how would you fix it?
Asked once · last asked Apr 7 · Scenario · Senior
If you receive 10,000 routes but want to advertise only your 20 routes, how would you configure that?
Asked once · last asked Apr 7 · Scenario · Senior
Other ways it was asked
- “What BGP configuration would you use to advertise only 20 routes while receiving 10,000?”
How would you advertise only your own subnets in BGP, and when would you use static entries versus another method?
Asked once · last asked Apr 7 · Scenario · Senior
How would you make new routes propagate automatically without manually changing a route map, route filter, or access list each time?
Asked once · last asked Apr 7 · Scenario · Senior
What are the main components of a Meraki or Viptela SD-WAN solution?
Asked once · last asked Apr 7 · Concept · Mid-level
What roles do vManage, vBond, and vSmart each perform?
Asked once · last asked Apr 7 · Concept · Mid-level
Which protocol does Cisco SD-WAN use to establish control connections between its controllers and WAN edge devices?
Asked once · last asked Apr 7 · Concept · Mid-level
What is the administrative distance of OMP?
Asked once · last asked Apr 15 · Concept · Mid-level
How would you onboard a new router into an SD-WAN fabric? Can you walk me through the steps?
Asked once · last asked Apr 15 · Scenario · Mid-level
On a dual-homed connection, how would you use one ISP to receive routes and the other to send routes?
Asked once · last asked Apr 15 · Scenario · Senior
How do you use a route reflector in SD-WAN?
Asked once · last asked Apr 15 · Concept · Senior
What are the administrative distances for BGP, OSPF, and EIGRP?
Asked once · last asked Apr 24 · Concept · Junior
What is the administrative distance of OMP in Cisco SD-WAN?
Asked once · last asked Apr 24 · Concept · Mid-level
What is the administrative distance for an EIGRP summary route?
Asked once · last asked Apr 24 · Concept · Mid-level
How do you configure an OSPF area to generate Type 7 LSAs, and what is the default external LSA type in Cisco?
Asked once · last asked Apr 24 · Tooling · Mid-level
How would you configure dual-ISP redundancy with automatic failover on a Palo Alto firewall?
Asked once · last asked Apr 27 · Tooling · Senior
Can you walk me through how BGP selects its best route and installs it in the routing table?
Asked once · last asked Apr 27 · Concept · Mid-level
What Cisco router command would you use to configure BGP local preference for outbound traffic?
Asked once · last asked Apr 27 · Tooling · Mid-level
Walk me through the steps to configure BGP local preference on a router so outbound traffic prefers one internet circuit.
Asked once · last asked Apr 27 · Tooling · Senior
What is the default route on a firewall?
Asked once · last asked May 12 · Concept · Junior
If you have two identical routes to the same destination over links to another autonomous system, how would you use BGP to make one link preferred for most of the traffic?
Asked once · last asked May 26 · Scenario · Senior
What should you consider when establishing an OSPF adjacency between two routers?
Asked once · last asked May 26 · Concept · Mid-level
How do you configure IP multicast, and how do sparse mode and dense mode differ?
Asked once · last asked May 26 · Concept · Mid-level
What technologies are used to deliver Central Office parameters to the point of sale?
Asked once · last asked Jun 8 · Design · Mid-level
In a data center with two routers, each connected to a different ISP and to a Nexus-based LAN, how would you ensure that Router 1's ISP is always preferred? Which protocol would you use, and how would you handle it?
Asked once · last asked Jun 11 · Scenario · Senior
How would you ensure that traffic from the data center LAN is sent to Router 1?
Asked once · last asked Jun 11 · Scenario · Senior
What is GRE (Generic Routing Encapsulation), and what are its advantages and limitations?
Asked once · last asked Jul 2 · Concept · Mid-level
What is MPLS (Multiprotocol Label Switching), and how does it work?
Asked once · last asked Jul 2 · Concept · Mid-level
How would you segment and configure a student network, including traffic management with QoS?
Asked once · last asked Jul 16 · Scenario · Mid-level
How would you integrate Fortinet appliances into an SD-WAN network, and what connectivity considerations would you address?
Asked once · last asked Jul 16 · Design · Mid-level
How does SD-WAN handle path health versus the old OSPF cost approach?
Asked once · last asked Jul 17 · Concept · Mid-level
In a Versa SD-WAN deployment, how do tunnel-based overlays and the underlay network work, and how does the SD-WAN functionality operate?
Asked once · last asked Jul 21 · Concept · Senior
How would you design traffic policies for a site using private IP service and other circuits, including failover and QoS?
Asked once · last asked Jul 21 · Scenario · Senior
How do you use BGP for perimeter Internet-facing routing, and how do you troubleshoot or configure it?
Asked once · last asked Jul 21 · Scenario · Senior
When a router learns the same route from two routing protocols, how does it choose which route to install?
Asked once · last asked Jul 31 · Concept · Mid-level
When would you use MPLS over other forms of Internet or cellular connectivity?
Asked once · last asked Aug 4 · Scenario · Mid-level
How do route reflectors affect BGP topology, and what should you consider when designing complex BGP architectures?
Asked once · last asked Aug 10 · Concept · Senior
What are the trade-offs of consolidating a vendor's three SD-WAN solutions into one?
Asked once · last asked Aug 13 · Scenario · Senior
Other ways it was asked
- “What do you think about HPE's three SD-WAN solutions, and should they be consolidated into one?”
Why is eBGP not coming up despite having Layer 3 reachability and a functional IPsec tunnel?
Asked once · last asked Aug 17 · Scenario · Senior
How can BGP be configured to install both routes as best paths and load-balance traffic across both tunnels?
Asked once · last asked Aug 17 · Concept · Senior
If we want to make the second tunnel act as a standby tunnel from a routing perspective, how would we achieve that?
Asked once · last asked Aug 17 · Scenario · Senior
Besides MED or weight, what are some other ways to influence the BGP path to make a tunnel standby?
Asked once · last asked Aug 17 · Concept · Senior
Can you give me a high-level explanation of VRFs, using an analogy for someone who understands VLANs but doesn't use VRFs on-prem?
Asked once · last asked Aug 17 · Concept · Mid-level
If we have overlapping IP address spaces in two different VRFs but need to advertise a specific network between them, what can we do?
Asked once · last asked Aug 17 · Scenario · Senior
What are route reflectors, /30 subnets, NETCONF, and YANG?
Asked once · last asked Aug 19 · Concept · Mid-level
How would you configure two Cisco routers so that link B is preferred for all traffic and link A provides dynamic failover?
Asked once · last asked Aug 26 · Scenario · Senior
Which BGP technique affects inbound traffic versus outbound traffic?
Asked once · last asked Aug 26 · Concept · Senior
When you redistribute BGP routes into OSPF, how do those routes appear in the downstream core router’s routing table?
Asked once · last asked Aug 26 · Concept · Senior
How would you design failover between two ISPs and firewalls while avoiding asymmetric routing?
Asked once · last asked Sep 17 · Design · Senior
How can BGP local preference be used to prioritize one ISP link over another?
Asked once · last asked Sep 17 · Concept · Senior
A BGP route reflector rebooted and its sessions re-established, but certain prefixes disappeared from only some routers. How would you troubleshoot the issue?
Asked once · last asked Sep 25 · Scenario · Senior
How would you troubleshoot traffic between two sites taking a suboptimal path in a network running OSPF and BGP?
Asked once · last asked Sep 29 · Scenario · Senior
Why can asymmetric routing be a problem?
Asked once · last asked Sep 29 · Concept · Mid-level
Other ways it was asked
- “Can you describe scenarios where asymmetric routing is acceptable or desirable?”
How would you determine whether a suboptimal path is caused by IGP or BGP path selection?
Asked once · last asked Sep 29 · Scenario · Senior
How would you influence network path selection without changing the physical topology?
Asked once · last asked Sep 29 · Scenario · Senior
How do BGP attributes such as local preference and AS path influence traffic direction?
Asked once · last asked Sep 29 · Concept · Senior
How can OSPF area design help prevent routing loops?
Asked once · last asked Sep 29 · Concept · Senior
How do OSPF's backbone area and its connections to other areas help prevent routing loops?
Asked once · last asked Sep 29 · Concept · Senior
Other ways it was asked
- “How does OSPF's backbone area and its connections to other areas affect routing-loop prevention?”
How would you detect a routing loop without relying on a customer report?
Asked once · last asked Sep 29 · Scenario · Senior
How would you monitor BGP and OSPF announcements and TTL expiration messages to detect a routing loop?
Asked once · last asked Sep 29 · Scenario · Senior
What BGP data would you collect from Cisco or Juniper devices, and how would you build a system to use it?
Asked once · last asked Sep 29 · Design · Senior
What is EIGRP?
Asked once · last asked Feb 19 · Concept · Junior
What does the forwarding metric mean in the OSPF route output?
Asked once · last asked Feb 27 · Concept · Mid-level
What is administrative distance, and why is it relevant?
Asked once · last asked Mar 6 · Concept · Junior
What does redistribution mean in routing?
Asked once · last asked Mar 6 · Concept · Junior
How does a router select the best route?
Asked once · last asked Mar 6 · Concept · Mid-level
Which routing protocol has an administrative distance of 200?
Asked once · last asked Mar 6 · Concept · Junior
Why would you choose not to use eBGP?
Asked once · last asked Apr 7 · Concept · Mid-level
After weight, what is the next BGP path-selection attribute?
Asked once · last asked Apr 27 · Concept · Mid-level
Other ways it was asked
- “Are there any other attributes in the BGP path-selection process?”
What other BGP techniques can influence which link is selected?
Asked once · last asked May 26 · Concept · Senior
What is HSRP, and how does it provide gateway redundancy?
Asked once · last asked May 26 · Concept · Junior
What is network routing, and how does it direct traffic between networks?
Asked once · last asked Jun 8 · Concept · Junior
Explain the roles of routing, dynamic routing, VPNs, and firewalls in a network.
Asked once · last asked Jun 16 · Concept · Mid-level
At a high level, how do businesses connect multiple sites to one another?
Asked once · last asked Aug 4 · Design · Mid-level
What is policy routing?
Asked once · last asked Aug 4 · Concept · Mid-level
How does MPLS work in a service provider network?
Asked once · last asked Aug 10 · Concept · Mid-level
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How this list is made
Every question here was asked by a real interviewer in a real job interview that a candidate ran MeetAssist in. After the call, the interviewer's questions are pulled from the transcript. Practice sessions, tests, exams and anything that was not a job interview are dropped.
Questions are rewritten so they make sense on their own: names of people, employers and clients are removed, and speech-to-text mistakes are fixed. Small talk, logistics and questions about one candidate's own résumé are left out. Rephrasings of the same question are merged, and the count is the number of different interviews it came up in.
The interviews come from candidates who use MeetAssist, so they lean towards software, data and AI roles: the shares describe these interviews, not every Computer Networks interview. Answers to the most asked questions are written and checked by an editor; a "common mistake" is shown only when reviews of real answers in these interviews show it, with the count.
337 interviews, 208 candidates, Nov 2025 to Oct 2026. Updated every month with new interviews.
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