R2O-SON-BRC-SA-R1 – Enterprise SONiC Course

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R2O-SON-BRC-SA-R1-M1: SONiC Introduction

6 Lessons
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1 Exam
- SONiC Introduction (R2O-SON-BRC-SA-R1-M1-E1)
R2O-SON-BRC-SA-R1-M2: Initial SONiC Setup

6 Lessons
|
1 Exam
- Initial SONiC Setup (R2O-SON-BRC-SA-R1-M2-E1)
R2O-SON-BRC-SA-R1-M3: Introducing the CLI Interface and Interface Configuration

5 Lessons
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1 Exam
- Introducing the CLI Interface and Interface Configuration (R2O-SON-BRC-SA-R1-M3-E1)
R2O-SON-BRC-SA-R1-M4: Redundancy Methods

6 Lessons
|
1 Exam
- Redundancy Methods (R2O-SON-BRC-SA-R1-M4-E1)
R2O-SON-BRC-SA-R1-M5: Routing Protocols in SONiC

10 Lessons
|
1 Exam
- Routing Protocols in SONiC (R2O-SON-BRC-SA-R1-M5-E1)
R2O-SON-BRC-SA-R1-M6: Automation

5 Lessons
|
1 Exam
- Automation (R2O-SON-BRC-SA-R1-M6-E1)
R2O-SON-BRC-SA-R1-M7: Troubleshooting, Management and Monitoring

10 Lessons
|
1 Exam
- Troubleshooting, Management and Monitoring (R2O-SON-BRC-SA-R1-M7-E1)
R2O-SON-BRC-SA-R1-M8: VXLAN/EVPN

6 Lessons
|
1 Exam
- VXLAN/EVPN (R2O-SON-BRC-SA-R1-M8-E1)
R2O-SON-BRC-SA-R1-M9: Campus Deployments

4 Lessons
|
1 Exam
- Campus Deployments (R2O-SON-BRC-SA-R1-M9-E1)

Participants 78

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Routing Protocols in SONiC (R2O-SON-BRC-SA-R1-M5-E1)

Volker December 14, 2022

R2O-SON-BRC-SA-R1 – Enterprise SONiC Course R2O-SON-BRC-SA-R1-M5: Routing Protocols in SONiC Routing Protocols in SONiC (R2O-SON-BRC-SA-R1-M5-E1)

Test your knowledge about Open Networking with this short quiz and receive your certificate, if you manage to get at least 80% of the answers correct. The quiz consists of 23 multiple-choice questions and takes approx. 10–15 minutes to complete.

There is no time limit or any restriction on how many times you can repeat the quiz.

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Question 1 of 23

1. Question
Which is NOT a benefit of layer 3 networks?
- Limited broadcast domains
- Scalability with route summarisation and filtering
- Little configuration needed
- Many options to filter traffic
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Question 2 of 23

2. Question
Which process in SONiC manages the routing table?
- bgpd
- zebra
- fpmsyncd
- quagga
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Question 3 of 23

3. Question
Which configuration option in SONiC allows a uniform CLI configuration of routing protocols and other features?
- vtysh
- CLICK
- JSON configuration files
- Klish
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Question 4 of 23

4. Question
Which task is NOT required to configure BGP?
- Configure BGP process
- Add Neighbours
- Enable BGP on interfaces
- Add address families
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Question 5 of 23

5. Question
What is NOT a valid BGP neighbour specifiation?
- MAC address
- IPv6 address
- interface
- IPv4 address
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Question 6 of 23

6. Question
What is required to establish a BGP un-numbered neighbourship?
- IPv6 forwarding on interface
- Point-to-point link
- Neighbour interface configuration command
- All of the above
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Question 7 of 23

7. Question
What is always required in a BGP neighbour configuration?
- Source interface configuration
- AS specification of neighbour
- MD5 authentication
- Own AS to use
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Question 8 of 23

8. Question
Where are networks to be advertised configured?
- Address family under router process
- Router process
- Address family under neighbour
- Neighbour
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Question 9 of 23

9. Question
How many ECMP routes can be used with default configuration?
- 1
- 2
- 4
- 8
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Question 10 of 23

10. Question
What is a difference between prefixes advertised with network command and redistributed ones?
- Redistribution requires route in routing table, network command does not
- Network command creates a shorter AS path
- Origin code metric is different
- Redistribution can be used for any source routing protocol, network command works only for connected routes
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Question 11 of 23

11. Question
What must be done for a neighbour to advertise prefixes of a particular address family?
- Apply an outbound policy
- Redistribute routes into BGP
- Nothing, prefixes are always advertised
- Activate neighbour for address family
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Question 12 of 23

12. Question
What status will the command show bgp summary display for a working BGP session?
- Established
- Active
- Connected
- Number of prefixes received from neighbour
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Question 13 of 23

13. Question
The show bgp command doesn‘t display anything in the Local Preference column for a path. What is wrong?
- Nothing, the path is external and as such doesn‘t have a Local Preference
- The local preference is configured with default settings
- The path is not valid because the next hop cannot be reached
- The neighbour doesn‘t support the Local Preference capability
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Question 14 of 23

14. Question
What would be a reason to divide an OSPF domain into multiple areas?
- Security: can filter routes between areas
- Scalability: less CPU resource, summarisation of routes
- Throughput: ECMP can only work with parallel areas
- Each address family is represented by a separate area
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Question 15 of 23

15. Question
Which type of routes will be replaced by a default route in a stub area?
- Routes from other areas
- External routes
- Both routes from other areas and external routes
- None, all routes will be seen
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Question 16 of 23

16. Question
Interface Ethernet 0 is configured with an IP address of 172.16.1.2/24. Which commands will NOT enable OSPF on it?
- interface Ethernet 0 ip ospf area 1
- router ospf network 172.16.1.0/24 area 1
- router ospf network 0.0.0.0/0 area 1
- router ospf ip ospf interface Ethernet 0 area 1
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Question 17 of 23

17. Question
An OSPF neighbour shows a state of 2-way. What is the most likely reason?
- An adjacency to this neighbour has been established successfully
- A misconfiguration prevents the neighbours from exchanging LSAs
- No adjacency is formed because neither the neighbour nor the local router is Designated Router in the network
- The adjacency was up before but the neighbour is no longer reachable
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Question 18 of 23

18. Question
How should the next hop of a static route be configured if any available path to the next hop should be used?
- Outgoing interface only
- Next hop IP address only
- Next hop IP address + outgoing interface
- Next hop IP address + recursive keyword
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Question 19 of 23

19. Question
What happens if you configure a number as the last parameter of a static route?
- This is the administrative distance, so a high number will make the route more preferred
- This is a VLAN tag that is attached to all packets using that route
- This is the administrative distance, so a low number will make the route more preferred
- This indicates the lifetime of the route, it will disappear after the given number of minutes
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Question 20 of 23

20. Question
You expect a BGP route to 10.100.0.0/16, but you see the following in the routing table:
S>* 10.100.0.0/16 via 10.50.1.1 Ethernet48 250/0 00:03:00
What happened?
- The „S“ at the beginning indicates that this is a BGP summary route
- Static routes are always preferred over BGP routes
- The static route has a metric of 0, so it is preferred over the BGP route
- There must be a problem with the BGP routing, so this floating static route becomes visible
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Question 21 of 23

21. Question
In the OSPF database you see a network LSA for 10.100.20.0/24, and in the BGP table you see an external prefix 10.100.0.0/16. Which route will be used to reach 10.100.20.30, and why?
- The BGP route, because external BGP has a better administrative distance than OSPF
- The OSPF route, because OSPF has a better administrative distance than external BGP
- The BGP route, because the more generic route is preferred
- The OSPF route, because the more specific route is preferred
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Question 22 of 23

22. Question
You use un-numbered interfaces to reach your DHCP server, but the server knows the loopback interface of your switch. How can you make DHCP relay work?
- sonic(config-if-Ethernet0)# ip dhcp-relay source-interface Loopback0
- sonic(config-if-Loopback0)# ip dhcp-relay source-interface Ethernet0
- sonic(config-if-Loopback0)# ip dhcp-relay source-interface
- sonic(config)# ip dhcp-relay source-interface Loopback 0
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Question 23 of 23

23. Question
In which situation can BFD help you react more quickly?
- Direct link between routers goes down
- Link towards peer on downstream layer 2 switch fails
- Peer router is rebooted
- Address family is not configured on peer router
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R2O-SON-BRC-SA-R1 – Enterprise SONiC Course

Participants 78

Routing Protocols in SONiC (R2O-SON-BRC-SA-R1-M5-E1)

Volker December 14, 2022

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