NRS Exam Questions With 100%
Correct Answers 2025
Which TCP/IP layer is responsible for path determination and end-to-end forwarding of datagrams? a.
The Application layer b. The Transport layer c. The Internet layer d. The Link layer - CORRECT ANSWERS -
c. The Internet layer
What information is part of the encapsulation done at the Link layer? a. Source and destination MAC
addresses b. Source and destination IP addresses c. Source and destination port numbers d. Source and
destination email addresses - CORRECT ANSWERS - a. Source and destination MAC addresses
Which of the following is NOT a function of the control plane in a router? a. To exchange control
messages with other routers b. To collaborate with other routers to find the best way to forward data
packets c. To populate the routing table and the tunnel table d. To forward data packets towards their
destination - CORRECT ANSWERS - d. To forward data packets towards their destination
Which of the following shows a typical data packet flow when egressing a Nokia 7750 SR? a. SF/CPM ->
MDA -> IOM -> SFP b. SF/CPM -> SFP -> IOM -> MDA c. SF/CPM -> IOM -> MDA -> SFP d. MDA -> IOM ->
SF/CPM -> SFP - CORRECT ANSWERS - c. SF/CPM -> IOM -> MDA -> SFP
Which of the following about MD-CLI is FALSE? a. MD-CLI allows atomic transactions. b. Multiple users
may edit the global candidate configuration concurrently. c. Configuration changes are activated when a
candidate configuration datastore is committed. d. Uncommitted configuration changes are saved when
a user exits the private configuration edit mode. - CORRECT ANSWERS - d. Uncommitted configuration
changes are saved when a user exits the private configuration edit mode.
If one user is in the private configuration edit mode and another one is in the read-only configuration
edit mode, which candidate configuration datastore do they have access to? a. Both users have access
to the global configuration datastore. b. Both users have access to the same private configuration
datastore. c. The read-only user has access to the global configuration datastore and the private user
has access to its own configuration datastore. d. The read-only user has access to the running
configuration datastore and the private user has access to the global configuration datastore. - CORRECT
, ANSWERS - c. The read-only user has access to the global configuration datastore and the private user
has access to its own configuration datastore.
Which of the following actions exits the MD-CLI implicit configuration mode? a. Navigating to a CLI
context outside the configuration branch b. Navigating to the root CLI context c. Issuing a full show
command d. Issuing the quit-config command - CORRECT ANSWERS - b. Navigating to the root CLI
context
Which of the following displays the hierarchical structure of the available CLI commands at the current
context level? a. show b. info c. tree d. help - CORRECT ANSWERS - c. tree
Which of the following is NOT a valid log destination in a Nokia 7750 SR? a. Main b. CLI c. Syslog d.
Console - CORRECT ANSWERS - a. Main
Which of the following is NOT a characteristic of a hub? a. It can interconnect hosts located in the same
local area network. b. It replicates Ethernet frames across all ports except the receiving port. c. It
inspects layer-2 frame headers. d. Devices connected to it must operate in half-duplex mode. - CORRECT
ANSWERS - c. It inspects layer-2 frame headers
Which address type is used to send frames to all devices in a Local Area Network? a. Anycast b. Multicast
c. Broadcast d. Unicast - CORRECT ANSWERS - c. Broadcast
What happens when a switch receives an Ethernet frame with an unknown source MAC address and a
destination MAC address of ff:ff:ff:ff:ff:ff? a. The destination MAC address is saved in the MAC FDB, and
the frame is discarded. b. The destination MAC address is saved in the MAC FDB, and the frame is
flooded to all ports except the receiving port. c. The source MAC address is saved in the MAC FDB, and
the frame is discarded. d. The source MAC address is saved in the MAC FDB, and the frame is flooded to
all ports except the receiving port. - CORRECT ANSWERS - d. The source MAC address is saved in the
MAC FDB, and the frame is flooded to all ports except the receiving port
14. Which of the following statements about VLAN stacking is FALSE? a. It allows a service provider to
support customers that use overlapping VLAN IDs. b. It increases the number of customers sending
VLAN-tagged traffic that a service provider can support. c. It increases the size of the VLAN ID field in the
Ethernet header. d. It allows a service provider to add another VLAN tag to traffic. - CORRECT ANSWERS
- c. It increases the size of the VLAN ID field in the Ethernet header
Correct Answers 2025
Which TCP/IP layer is responsible for path determination and end-to-end forwarding of datagrams? a.
The Application layer b. The Transport layer c. The Internet layer d. The Link layer - CORRECT ANSWERS -
c. The Internet layer
What information is part of the encapsulation done at the Link layer? a. Source and destination MAC
addresses b. Source and destination IP addresses c. Source and destination port numbers d. Source and
destination email addresses - CORRECT ANSWERS - a. Source and destination MAC addresses
Which of the following is NOT a function of the control plane in a router? a. To exchange control
messages with other routers b. To collaborate with other routers to find the best way to forward data
packets c. To populate the routing table and the tunnel table d. To forward data packets towards their
destination - CORRECT ANSWERS - d. To forward data packets towards their destination
Which of the following shows a typical data packet flow when egressing a Nokia 7750 SR? a. SF/CPM ->
MDA -> IOM -> SFP b. SF/CPM -> SFP -> IOM -> MDA c. SF/CPM -> IOM -> MDA -> SFP d. MDA -> IOM ->
SF/CPM -> SFP - CORRECT ANSWERS - c. SF/CPM -> IOM -> MDA -> SFP
Which of the following about MD-CLI is FALSE? a. MD-CLI allows atomic transactions. b. Multiple users
may edit the global candidate configuration concurrently. c. Configuration changes are activated when a
candidate configuration datastore is committed. d. Uncommitted configuration changes are saved when
a user exits the private configuration edit mode. - CORRECT ANSWERS - d. Uncommitted configuration
changes are saved when a user exits the private configuration edit mode.
If one user is in the private configuration edit mode and another one is in the read-only configuration
edit mode, which candidate configuration datastore do they have access to? a. Both users have access
to the global configuration datastore. b. Both users have access to the same private configuration
datastore. c. The read-only user has access to the global configuration datastore and the private user
has access to its own configuration datastore. d. The read-only user has access to the running
configuration datastore and the private user has access to the global configuration datastore. - CORRECT
, ANSWERS - c. The read-only user has access to the global configuration datastore and the private user
has access to its own configuration datastore.
Which of the following actions exits the MD-CLI implicit configuration mode? a. Navigating to a CLI
context outside the configuration branch b. Navigating to the root CLI context c. Issuing a full show
command d. Issuing the quit-config command - CORRECT ANSWERS - b. Navigating to the root CLI
context
Which of the following displays the hierarchical structure of the available CLI commands at the current
context level? a. show b. info c. tree d. help - CORRECT ANSWERS - c. tree
Which of the following is NOT a valid log destination in a Nokia 7750 SR? a. Main b. CLI c. Syslog d.
Console - CORRECT ANSWERS - a. Main
Which of the following is NOT a characteristic of a hub? a. It can interconnect hosts located in the same
local area network. b. It replicates Ethernet frames across all ports except the receiving port. c. It
inspects layer-2 frame headers. d. Devices connected to it must operate in half-duplex mode. - CORRECT
ANSWERS - c. It inspects layer-2 frame headers
Which address type is used to send frames to all devices in a Local Area Network? a. Anycast b. Multicast
c. Broadcast d. Unicast - CORRECT ANSWERS - c. Broadcast
What happens when a switch receives an Ethernet frame with an unknown source MAC address and a
destination MAC address of ff:ff:ff:ff:ff:ff? a. The destination MAC address is saved in the MAC FDB, and
the frame is discarded. b. The destination MAC address is saved in the MAC FDB, and the frame is
flooded to all ports except the receiving port. c. The source MAC address is saved in the MAC FDB, and
the frame is discarded. d. The source MAC address is saved in the MAC FDB, and the frame is flooded to
all ports except the receiving port. - CORRECT ANSWERS - d. The source MAC address is saved in the
MAC FDB, and the frame is flooded to all ports except the receiving port
14. Which of the following statements about VLAN stacking is FALSE? a. It allows a service provider to
support customers that use overlapping VLAN IDs. b. It increases the number of customers sending
VLAN-tagged traffic that a service provider can support. c. It increases the size of the VLAN ID field in the
Ethernet header. d. It allows a service provider to add another VLAN tag to traffic. - CORRECT ANSWERS
- c. It increases the size of the VLAN ID field in the Ethernet header
