CCNP Enarsi

Question 1

IPv6: RA Guard

Answer 1

Protects against rogue Router Advertisements (RA).

Question 2

IPv6: DHCPv6 Guard

Answer 2

Protects against rogue DHCPv6 servers.

Question 3

IPv6: Source Guard

Answer 3

Prevents IPv6 address spoofing by validating source addresses.

Question 4

IPv6: Prefix Guard

Answer 4

Blocks the advertisement of unauthorized IPv6 prefixes.

Question 5

IPv6: NA Guard

Answer 5

Protects against rogue Neighbor Advertisements (NA).

Question 6

IPv4: DHCPDISCOVER

Answer 6

Sent by the client to locate available DHCP servers.

Question 7

IPv4: DHCPOFFER

Answer 7

Sent by the DHCP server in response to a DHCPDISCOVER offering an IP lease.

Question 8

IPv4: DHCPREQUEST

Answer 8

Sent by the client to request an offered IP or renew an existing lease.

Question 9

DHCPACKIPv4:

Answer 9

Sent by the server to acknowledge the client’s DHCPREQUEST and finalize the IP lease.

Question 10

IPv4: DHCPNAK

Answer 10

Sent by the server if the requested IP address is invalid or cannot be assigned.

Question 11

IPv4: DHCPDECLINE

Answer 11

Sent by the client if the offered IP address is already in use.

Question 12

IPv4: DHCPRELEASE

Answer 12

Sent by the client to release the assigned IP address back to the server.

Question 13

IPv4: DHCPINFORM

Answer 13

Sent by the client to request additional configuration without obtaining an IP address.

Question 14

IPv6: SOLICIT

Answer 14

Sent by the client to discover available DHCPv6 servers.

Question 15

IPv6: ADVERTISE

Answer 15

Sent by the DHCPv6 server in response to a SOLICIT advertising its availability.

Question 16

IPv6: REQUEST

Answer 16

Sent by the client to request configuration or IP from the DHCPv6 server.

Question 17

IPv6: REPLY

Answer 17

Sent by the server in response to a REQUEST confirming the IP lease or providing configuration data.

Question 18

IPv6: RENEW

Answer 18

Sent by the client to renew a current lease before it expires.

Question 19

IPv6: REBIND

Answer 19

Sent by the client to extend an expiring lease if the original server is unreachable.

Question 20

IPv6: DECLINE

Answer 20

Sent by the client to reject an IP address that is already in use.

Question 21

IPv6: RELEASE

Answer 21

Sent by the client to release an assigned IP address.

Question 22

IPv6: CONFIRM

Answer 22

Sent by the client to confirm the validity of a previously assigned IP address.

Question 23

IPv6: INFORMATION-REQUEST

Answer 23

Sent by the client to request configuration information without an IP address.

Question 24

uRPF: Strict Mode

Answer 24

Checks if the source address of the packet has a valid route through the same interface it was received on.
“ip verify unicast source reachable-via rx”

Question 25

uRPF: Loose Mode

Answer 25

Checks if the source address has a valid route in the routing table regardless of the incoming interface. "ip verify unicast source reachable-via any"

Question 26

uRPF: VRF Mode

Answer 26

Used in Virtual Routing and Forwarding (VRF) environments to check routes within a specific VRF instance. "ip vrf forwarding VRF1 ip verify unicast source reachable-via rx"

Question 27

uRPF: Feasible Mode

Answer 27

Allows the packet if the source IP address has a valid route in the routing table or a feasible successor route in EIGRP. "ip verify unicast source reachable-via rx router eigrp 100 network 192.168.1.1"

Question 28

UDP Port: 1812

Answer 28

Default port for RADIUS authentication.

Question 29

UDP Port: 1813

Answer 29

Default port for RADIUS accounting.

Question 30

DNA Center: Overall Health Score

Answer 30

Represents the overall health of the network and devices based on various metrics.

Question 31

DNA Center: Device Health Score

Answer 31

Reflects the operational state of individual devices in the network.

Question 32

DNA Center: Application Health Score

Answer 32

Indicates the performance and availability of applications running in the network.

Question 33

DNA Center: Network Health Score

Answer 33

Measures the overall health of the network infrastructure including connectivity and performance.

Question 34

DNA Center: Wireless Health Score

Answer 34

Evaluates the performance and coverage of wireless networks including APs and clients.

Question 35

DNA Center: Client Health Score

Answer 35

Assesses the connectivity and performance of individual clients connected to the network.

Question 36

DNA Center: Security Health Score

Answer 36

Indicates the security posture of the network including compliance and threat detection.

Question 37

IPv6: Neighbor Solicitation (NS)

Answer 37

Used by a node to determine the link-layer address of a neighbor or to verify the reachability of a neighbor.

Question 38

IPv6: Neighbor Advertisement (NA)

Answer 38

Sent by a node in response to a Neighbor Solicitation or to announce its link-layer address change.

Question 39

IPv6: Router Solicitation (RS)

Answer 39

Sent by a host to discover available routers on the network.

Question 40

IPv6: Router Advertisement (RA)

Answer 40

Sent by routers to provide information about network prefixes parameters and their own link-layer addresses.

Question 41

IPv6: Redirect Message

Answer 41

Used to inform a host of a better first-hop address for a destination than the one it is currently using.

Question 42

OSPF: Backbone Area (Area 0)

Answer 42

The core area that connects all other OSPF areas.,Type 1, Type 2, Type 3, Type 4, Type 5

Question 43

OSPF: Standard Area

Answer 43

An area that can contain any type of LSA and can communicate with other areas.,Type 1, Type 2, Type 3, Type 4, Type 5

Question 44

OSPF: Stub Area

Answer 44

An area that does not receive external routes (Type 5 LSAs) and uses a default route for external networks.,Type 1, Type 2, Type 3, Type 4

Question 45

OSPF: Totally Stubby Area

Answer 45

Similar to a stub area, but does not receive summary routes (Type 3 and Type 4 LSAs) or external routes.,Type 1, Type 2

Question 46

OSPF: Not-So-Stubby Area (NSSA)

Answer 46

Allows the injection of external routes while still restricting other external route advertisements.,Type 1, Type 2, Type 3, Type 7

Question 47

LDP: Label Mapping

Answer 47

Used to associate a label with a specific FEC (Forwarding Equivalence Class) for label switching.

Question 48

LDP: Label Withdrawal

Answer 48

Sent to withdraw a previously assigned label from a specific FEC.

Question 49

LDP: Label Release

Answer 49

Used to release a label that is no longer needed typically in response to a Label Withdrawal.

Question 50

LDP: Label Request

Answer 50

Sent by a LSR (Label Switching Router) to request a label for a specific FEC from its peers.

Question 51

LDP: Label Notify

Answer 51

Used to inform a peer of a label change for a specific FEC.

Question 52

LDP: Hello

Answer 52

Used to discover and maintain neighbor relationships between LSRs.

Question 53

Log level: 0

Answer 53

(Emergency) System is unusable; indicates a serious failure.

Question 54

Log level: 1

Answer 54

(Alert)Immediate action needed; alerts that require immediate attention.

Question 55

Log level: 2

Answer 55

(Critical) Critical conditions; indicates a failure in a primary system component.

Question 56

Log level: 3

Answer 56

(Error)Error conditions; indicates an error that has occurred.

Question 57

Log level: 4

Answer 57

(Warning) Warning conditions; indicates a warning about a potential problem.

Question 58

Log level: 5

Answer 58

(Notice)Normal but significant conditions; used for important events that are not errors.

Question 59

Log level: 6

Answer 59

(Informational) Informational messages; used for normal operational messages.

Question 60

Log level: 7

Answer 60

(Debug) Debugging messages; used for diagnostic information primarily for troubleshooting.