Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet against the routing table?

Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet
against the routing table?

Which address is used by the Unicast Reverse Path Forwarding protocol to validate a packet
against the routing table?

A.
source address

B.
destination address

C.
router interface

D.
default gateway

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Marek

Marek

When Unicast RPF is enabled on an interface, the router examines all packets received as input on that interface to make sure that the source address and source interface appear in the routing table and match the interface on which the packet was received. This “look backwards” ability is available only when Cisco express forwarding (CEF) is enabled on the router, because the lookup relies on the presence of the Forwarding Information Base (FIB). CEF generates the FIB as part of its operation.

http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfrpf.html

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Babar

Babar

Answer is: A*

When a packet is received at the interface where Unicast RPF and ACLs have been configured, the following actions occur:

Step 1 Input ACLs configured on the inbound interface are checked.

Step 2 Unicast RPF checks to see if the packet has arrived on the best return path to the source, which it does by doing a reverse lookup in the FIB table.

Step 3 CEF table (FIB) lookup is carried out for packet forwarding.

Step 4 Output ACLs are checked on the outbound interface.

Step 5 The packet is forwarded.

http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfrpf.html

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Julius Simpson

Julius Simpson

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NEW QUESTION 469
IP CEF load-sharing options ……? (Choose three.)

A. Tunnel
B. Universal
C. Include-ports
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NEW QUESTION 470
What is the minimum privilege level to enter all commands in usermode?

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B. Level0
C. Level1
D. Level15

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Which two statements about password-protecting device access are true? (Choose two)

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C. A network administrator can recover an encrypted password.
D. The privilege level command controls the commands a specific user can execute.
E. The password can be encrypted in the running configuration.

Answer: DE

NEW QUESTION 472
Frame Relay LMI autosense. Which statements are true? (Choose two.)

A. Line should be up and protocol should be down.
B. Protocol must be up.
C. It only works on DTEs.
D. It only works on DCEs.

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NEW QUESTION 473
Which two protocols can cause TCP starvation? (Choose two.)

A. TFTP
B. SNMP
C. SMTP
D. HTTPS
E. FTP

Answer: AB

NEW QUESTION 474
Refer to the exhibit. How can you configure a second export destination for IP address 192.168.10.1?
configure terminal
ip flow-export destination 192.168.10.1 9991
ip flow-export version 9

A. specify a different TCP port
B. specify a different UDP port
C. specify a VRF
D. configure a version 5 flow-export to the same destination
E. specify a different flow ID

Answer: C

NEW QUESTION 475
Which value does Frame Relay use to identify a connection between a DTE and DCE?

A. DLCI
B. IP address
C. MAC address
D. VLAN ID

Answer: A

NEW QUESTION 476
Which two options are limitations of Stateful NAT64? (Choose two.)

A. it is unable to route VRF traffic
B. it is unable to route multicast traffic
C. it supports FTP traffic only with an ALG
D. it supports DNS64 only
E. layer 4 supports TCP only

Answer: AB

NEW QUESTION 477
If you want to migrate an IS-IS network to another routing protocol with ……? (Choose two.)

A. UDP
B. Internal BGP
C. TCP/IP
D. EIGRP
E. OSPF
F. RIP

Answer: DE

NEW QUESTION 478
……

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