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Certifications›300-410›Objectives›Bidirectional Forwarding Detection (BFD)
Objective 110.0

Bidirectional Forwarding Detection (BFD)

300-410 Practice Questions

Full Practice Test →All Objectives

300-410 Bidirectional Forwarding Detection (BFD) — Practice Questions

30 questions from this objective

Question 2mediummultiple choice
Review the full OSPF breakdown →

A network engineer is troubleshooting an OSPF adjacency that is flapping between two routers. The adjacency forms and then drops repeatedly. Both routers are configured for BFD on the OSPF interface. The engineer checks the BFD session and sees it is up, but the OSPF neighbor state transitions from FULL to DOWN every few seconds. What is the most likely cause of this issue?

Question 3hardmultiple choice
Study the full EIGRP explanation →

A network engineer is troubleshooting a scenario where two routers running EIGRP are not forming an adjacency. Both routers have BFD configured under the EIGRP process and on the interfaces. The BFD session is up and operational. However, the EIGRP neighbor status shows 'Pending' and never transitions to 'Up'. What is the most likely cause?

Question 4mediummultiple choice
Open the full BGP breakdown →

A network engineer is troubleshooting a BGP session that is dropping intermittently. The routers are connected via a Layer 2 switch. BFD is configured for the BGP session. The engineer notices that the BFD session goes down briefly, causing the BGP session to reset. The BFD timers are set to 100 ms interval with a multiplier of 3. The switch is not configured for BFD. What is the most likely cause?

Question 5mediummultiple choice
Review the full OSPF breakdown →

A network engineer is troubleshooting an OSPF adjacency that fails to come up. Both routers are directly connected via a serial link. BFD is enabled on the interface. The engineer sees that the BFD session is down. The OSPF configuration shows 'ip ospf bfd' under the interface. The serial interface is up/up. What should the engineer check first?

Question 6hardmultiple choice
Open the full BGP breakdown →

A network engineer is troubleshooting a BGP session that is not establishing. The routers are connected via a Layer 3 switch. BFD is configured for BGP. The engineer checks the BFD session and sees it is 'Down'. The BGP configuration appears correct. The interface between the routers is up/up. What is the most likely cause?

Question 7mediummultiple choice
Review the full OSPF breakdown →

A network engineer is troubleshooting an OSPF adjacency that is not forming. Both routers are running OSPF with BFD enabled. The engineer checks the BFD session and sees it is 'Up'. However, the OSPF neighbor state is stuck in 'INIT'. What is the most likely cause?

Question 8hardmultiple choice
Review the full routing breakdown →

A network engineer is troubleshooting a scenario where BFD sessions are not forming between two routers running IS-IS. Both routers have BFD configured under the IS-IS process and on the interfaces. The engineer checks the BFD session and sees it is 'Down'. The IS-IS adjacency is up and operational. What is the most likely cause?

Question 9mediummultiple choice
Open the full BGP breakdown →

A network engineer is troubleshooting a BGP session that is flapping. The routers are connected via a direct Ethernet cable. BFD is configured for the BGP session. The engineer checks the BFD session and sees it is 'Up'. However, the BGP session goes down every 30 seconds. The BGP configuration includes 'neighbor 10.0.0.2 fall-over bfd'. What is the most likely cause?

Question 10hardmultiple choice
Study the full EIGRP explanation →

A network engineer is troubleshooting an EIGRP adjacency that is not forming. Both routers are configured for EIGRP with BFD. The engineer checks the BFD session and sees it is 'Down'. The interface between the routers is up/up. The EIGRP configuration appears correct. What is the most likely cause?

Question 11mediummultiple choice
Review the full routing breakdown →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            1500(3)        Gi0/0

Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 1500(0) Rx Count: 120, Tx Count: 150

Based on this output, which statement is correct?

Question 12hardmultiple choice
Review the full routing breakdown →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Down          0(0)          Gi0/0

Session state is DOWN OurAddr: 10.1.1.1 Handle: 1 Local Diag: 1, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 0(0) Rx Count: 0, Tx Count: 50

Based on this output, what is the most likely cause of the BFD session being down?

Question 13mediummultiple choice
Review the full routing breakdown →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            3000(3)        Gi0/0

Session state is UP and using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 150, Tx Count: 150 Echo function: Active

Based on this output, which statement is correct?

Question 14hardmultiple choice
Review the full routing breakdown →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            3000(3)        Gi0/0

Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 500000, Received Multiplier: 3 Holddown (hits): 1500(0) Rx Count: 200, Tx Count: 200

Based on this output, what is the holddown timer value in milliseconds and why?

Question 15mediummultiple choice
Review the full routing breakdown →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            3000(3)        Gi0/0

Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100

Based on this output, what is the BFD session's negotiated transmit interval?

Question 16mediummultiple choice
Review the full routing breakdown →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            3000(3)        Gi0/0

Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100

Based on this output, what is the BFD session's negotiated receive interval?

Question 17mediummultiple choice
Review the full routing breakdown →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            3000(3)        Gi0/0

Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100

Based on this output, what is the BFD session's detection time?

Question 18easymultiple choice
Read the full NAT/PAT explanation →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            3000(3)        Gi0/0

Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100

Based on this output, what is the BFD session's local discriminator?

Question 19easymultiple choice
Read the full NAT/PAT explanation →

A network engineer runs the following command on Router R1:

R1# show bfd neighbors detail

IPv4 Sessions NeighborAddr LD/RD Int State Holdown(mult) Intf

10.1.1.2          1/3           Gi0/0      Up            3000(3)        Gi0/0

Session state is UP and not using echo function. OurAddr: 10.1.1.1 Handle: 1 Local Diag: 0, Demand mode: 0, Poll bit: 0 MinTxInt: 1000000, MinRxInt: 1000000, Multiplier: 3 Received MinRxInt: 1000000, Received Multiplier: 3 Holddown (hits): 3000(0) Rx Count: 100, Tx Count: 100

Based on this output, what is the BFD session's remote discriminator?

Question 20mediummultiple choice
Review the full OSPF breakdown →

Consider the following partial configuration on a router:

interface GigabitEthernet0/1
 ip address 10.1.1.1 255.255.255.252

bfd interval 100 min_rx 100 multiplier 3 !

router ospf 1
 network 10.1.1.0 0.0.0.3 area 0

!

What is the effect of this configuration?

Question 21mediummultiple choice
Study the full EIGRP explanation →

Examine the following configuration:

interface GigabitEthernet0/0
 ip address 192.168.1.1 255.255.255.0

bfd interval 50 min_rx 50 multiplier 5 !

router eigrp TEST
 network 192.168.1.0

bfd interface GigabitEthernet0/0 !

Which statement is true about BFD operation on this interface?

Question 22mediummultiple choice
Review the full OSPF breakdown →

A network engineer has configured BFD for OSPF as shown:

interface GigabitEthernet0/0

bfd interval 300 min_rx 300 multiplier 3 !

router ospf 1

bfd all-interfaces !

However, BFD sessions are not coming up. What is the most likely missing configuration?

Question 23mediummultiple choice
Open the full BGP breakdown →

Consider the following BGP configuration with BFD:

router bgp 65000
 neighbor 10.1.1.2 remote-as 65001
 neighbor 10.1.1.2 fall-over bfd

!

interface GigabitEthernet0/0
 ip address 10.1.1.1 255.255.255.252

bfd interval 200 min_rx 200 multiplier 4 !

What is the effect of the 'neighbor fall-over bfd' command?

Question 24mediummultiple choice
Review the full OSPF breakdown →

Examine the partial BFD configuration on a router:

interface GigabitEthernet0/0

bfd interval 100 min_rx 100 multiplier 3 !

interface GigabitEthernet0/1

bfd interval 200 min_rx 200 multiplier 3 !

router ospf 1

bfd all-interfaces !

The router has OSPF neighbors on both interfaces. Which statement is true?

Question 25mediummultiple choice
Review the full routing breakdown →

A router has the following BFD configuration for a static route:

ip route 10.0.0.0 255.255.255.0 192.168.1.2

bfd map 192.168.1.2 10.0.0.0 255.255.255.0

interface GigabitEthernet0/0
 ip address 192.168.1.1 255.255.255.0

bfd interval 100 min_rx 100 multiplier 3 !

What is the purpose of the 'bfd map' command in this context?

Question 26easymultiple choice
Full question →

What is the default BFD interval and multiplier on Cisco IOS-XE devices when BFD is enabled under an interface without explicit timer configuration?

Question 27mediummultiple choice
Full question →

Which of the following statements about BFD echo mode is true?

Question 28mediummultiple choice
Review the full routing breakdown →

According to RFC 5880, what is the maximum number of BFD sessions that can be supported by a single interface on a Cisco router?

Question 29mediummulti select
Review the full routing breakdown →

Which TWO commands can be used to verify the operational state of BFD sessions on a Cisco IOS-XE router? (Choose TWO.)

Question 30hardmulti select
Full question →

Which TWO statements about BFD echo mode are true? (Choose TWO.)

Question 31mediummulti select
Full question →

Which THREE symptoms indicate a BFD session failure? (Choose THREE.)

More Bidirectional Forwarding Detection (BFD) questions available in the full practice test.

Continue Practising →
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VPN Technologies

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All 300-410 Objectives

  • 100.Layer 3 Technologies35%
  • 101.EIGRP Troubleshooting
  • 102.OSPF Troubleshooting (v2/v3)
  • 103.BGP Troubleshooting
  • 104.Route Redistribution
  • 105.Policy-Based Routing (PBR)
  • 106.VRF-Lite
  • 107.Route Maps and Route Filtering
  • 108.Administrative Distance
  • 109.Route Summarization
  • 110.Bidirectional Forwarding Detection (BFD)
  • 200.VPN Technologies20%
  • 201.MPLS Operations
  • 202.MPLS L3VPN
  • 203.DMVPN
  • 204.IPsec Site-to-Site VPN
  • 205.IPv6 Tunneling Techniques
  • 300.Infrastructure Security20%
  • 301.Device Access Control
  • 302.IPv4 Access Control Lists
  • 303.IPv6 Traffic Filtering and uRPF
  • 304.Control Plane Policing (CoPP)
  • 305.IPv6 First Hop Security
  • 400.Infrastructure Services25%
  • 401.Device Management
  • 402.SNMP Troubleshooting
  • 403.Network Logging and Syslog
  • 404.Embedded Event Manager (EEM)
  • 405.IP SLA
  • 406.NetFlow and Flexible NetFlow
  • 407.SPAN, RSPAN, and ERSPAN
  • 408.DHCP (IPv4 and IPv6)
  • 409.NAT and PAT