NRS-1 Questions

ryan abbott
Quiz by ryan abbott, updated more than 1 year ago More Less
ryan abbott
Created by ryan abbott over 1 year ago
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NRS-1 Nokia Exam Questions

Resource summary

Question 1

Question
Which of the following is the physical infrastructure that provides interconnections between ISPs?
Answer
  • demarcation point
  • An Internet exchange point
  • A central office
  • A point of presence

Question 2

Question
Which of the following provides physical separation between service provider and customer responsibilities?
Answer
  • A provider edge router
  • An Internet exchange point
  • A demarcation point
  • A point of presence

Question 3

Question
Which TCP/IP layer is responsible for path determination and end-to-end forwarding of datagrams?
Answer
  • The application services layer
  • The transport layer
  • The Internet protocol layer
  • The network interface layer

Question 4

Question
What information is part of the encapsulation done at the network interface layer?
Answer
  • Source and destination MAC addresses
  • Source and destination IP addresses
  • Source and destination port numbers
  • Source and destination email addresses

Question 5

Question
Which of the following shows a typical data packet flow when egressing an Nokia 7750 SR?
Answer
  • SF/CPM -> MDA -> IOM -> SFP
  • SF/CPM -> SFP -> IOM -> MDA
  • SF/CPM -> IOM -> MDA -> SFP
  • MDA -> IOM -> SF/CPM -> SFP

Question 6

Question
Which of the following is not a recommended usage of the compact flashes on an Nokia 7750 SR?
Answer
  • Using CF 1 to store debug logs.
  • Using CF 2 to store debug logs.
  • Using CF 3 to store accounting logs.
  • Using CF 3 to store system files.

Question 7

Question
Which of the following displays a hierarchial CLI command structure at the current context level?
Answer
  • show
  • info
  • tree
  • help

Question 8

Question
Which of the following is NOT a valid log destination in an Nokia 7750 SR?
Answer
  • Main
  • Session
  • Syslog
  • Console

Question 9

Question
Which one of the following log-IDs is typically reserved for Network Management on an Nokia 7750 SR
Answer
  • 0
  • 98
  • 99
  • 100

Question 10

Question
Which of the following is NOT a type of Layer 2 network?
Answer
  • Point-to-point network
  • Circuit-based network
  • Virtual private routed network
  • Shared network

Question 11

Question
Which of the following statements about SONET/SDH is FALSE?
Answer
  • SONET/SDH is a Layer-1 technology
  • SDH is used primarily in North America
  • The basic SONET frame is the STS-1.
  • An STS-1 frame is exactly one third of an STM-1 frame

Question 12

Question
Which Ethernet frame field is found in the Ethernet II frame header but NOT in the Ethernet 802.3 frame header?
Answer
  • Preamble
  • Start Frame Delimiter
  • Source address
  • Type

Question 13

Question
Which address type is used to send frames to all devices in a Local Area Network?
Answer
  • Anycast
  • Multicast
  • Broadcast
  • Unicast

Question 14

Question
Which of the following is NOT a characteristic of a hub?
Answer
  • It performs signal amplification.
  • It replicates Ethernet frames across all ports except the receiving port.
  • It inspects Layer 2 frame headers.
  • It operates in half-duplex mode.

Question 15

Question
After all PCs in the below network have communicated with each other, which interface will switch D populate in its MAC FDB for PC1?
Answer
  • 1/1/1
  • 1/1/2
  • 1/1/3
  • 1/1/4
  • 1/1/6

Question 16

Question
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?
Answer
  • The destination MAC address is saved in the MAC FDB, and the frame is discarded.
  • The destination MAC address is saved in the MAC FDB, and the frame is flooded to all ports except the receiving port.
  • The source MAC address is saved in the MAC FDB, and the frame is discarded.
  • The source MAC address is saved in the MAC FDB, and the frame is flooded to all ports except the receiving port.

Question 17

Question
An Ethernet Local Area Network (LAN) consists of the components shown in the diagram. How many broadcast and collision domains are on this LAN?
Answer
  • 2 broadcast domains, 7 collision domains
  • 2 broadcast domains, 9 collision domains
  • 3 broadcast domains, 7 collision domains
  • 3 broadcast domains, 9 collision domains
  • 7 broadcast domains, 9 collision domains

Question 18

Question
Which of the following statements about LAG is FALSE?
Answer
  • It aggregates physical links between devices
  • It provides point-to-point redundancy between devices.
  • It supports auto-negotiation on ports in the LAG
  • It improves performance by increasing bandwidth between devices.

Question 19

Question
Which of the following protocols is used to prevent loops in Ethernet networks?
Answer
  • LAG
  • STP
  • ARP
  • ICMP

Question 20

Question
An 8-port Ethernet switch is configured with VLAN 100 on ports 1-4, and VLAN 200 on ports 5-8. What happens when the switch receives a frame with an unknown destination address on port 1?
Answer
  • The switch will flood the frames on ports 1 to 4.
  • The switch will flood the frames on ports 2 to 4.
  • The switch will flood the frames on ports 5 to 8.
  • The switch will flood the frames on ports 2 to 8.

Question 21

Question
Which of the following statements about VLAN stacking is FALSE?
Answer
  • It allows a service provider to support customers that use overlapping VLAN IDs.
  • It increases the number of VLANs a service provider can support.
  • It increases the size of the VLAN ID field in the Ethernet header.
  • It allows a service provider to add another VLAN tag to traffic.

Question 22

Question
Which of the following is used to connect multiple broadcast domains?
Answer
  • Hub
  • Switch
  • Router
  • Repeater

Question 23

Question
Which of the following IP header fields is used to distinguish IPv4 from IPv6 traffic?
Answer
  • Type of Service
  • Version
  • Identification
  • Protocol

Question 24

Question
Which of the following is NOT a Regional Internet Registry?
Answer
  • ARIN
  • IANA
  • RIPE NCC
  • AfriNIC

Question 25

Question
Which of the following is a unicast address that is assigned to two or more devices on the same network?
Answer
  • Network address
  • Broadcast address
  • Multicast address
  • Anycast address

Question 26

Question
Which of the following about hierarchical IPv4 addressing is FALSE?
Answer
  • It creates a two-level address hierarchy.
  • It increases the number of IP addresses available in the Internet.
  • It supports route summarization to reduce routing table size.
  • It supports subnetting to divide a network into smaller networks.

Question 27

Question
A network has an address of 206.47.132.0 and a network mask of 255.255.254.0. How many subnetworks can be created if each subnetnetwork must have at least 25 hosts?
Answer
  • 4
  • 8
  • 16
  • 32

Question 28

Question
Which of the following is the broadcast address of the network to which host 172.16.176.135/18 belongs?
Answer
  • 172.16.176.255
  • 172.16.191.255
  • 172.16.255.255
  • 172.255.255.255

Question 29

Question
How many subnets can be created from network 138.120.140.0/22 if each subnet must support 126 hosts?
Answer
  • 4
  • 8
  • 16
  • 32

Question 30

Question
Which of the following statements about a system IP address on an Nokia 7750 SR is FALSE?
Answer
  • It is a loopback address.
  • It has a fixed prefix value of /32.
  • It is manually configured by an operator.
  • It is associated with the management port.

Question 31

Question
Which of the following is a characteristic of route aggregation?
Answer
  • It summarizes subnet addresses into classful addresses.
  • It maps multiple private IP addresses into one public IP address.
  • It divides a network into multiple subnets.
  • It reduces the number of route advertisements within a network.

Question 32

Question
What is the most specific aggregate prefix for the following 3 subnets?
Answer
  • 134.234.123.0/25
  • 134.234.123.0/24
  • 134.234.123.128/24
  • 134.234.122.0/23

Question 33

Question
Which of the following is NOT part of the IP forwarding process?
Answer
  • Perform longest match lookup for the destination IP address.
  • Perform MAC address learning.
  • Push traffic through the switch fabric.
  • Identify physical egress interface.

Question 34

Question
Which DHCP message is used by a client to inform a DHCP server that it accepts the assigned IP address?
Answer
  • Discover
  • Request
  • Offer
  • Acknowledgement

Question 35

Question
What type of message is an ARP response?
Answer
  • A unicast message
  • A broadcast message
  • A multicast message
  • An anycast message

Question 36

Question
Which of the following statements about ICMP is TRUE?
Answer
  • ICMP is used to resolve a MAC address for a given IP address.
  • ICMP messages are generated by Ethernet switches.
  • ICMP messages are encapsulated within IP datagrams.
  • ICMP relies on the CSMA/CD algorithm

Question 37

Question
Which of the following about the routing table on an Nokia 7750 SR is false?
Answer
  • The routing table is maintained by the CPM
  • The routing table contains next-hop information
  • The routing table is used in the MPLS data plane
  • The routing table is used to construct a forwarding table

Question 38

Question
Which of the following protocols is NOT used to build a routing table?
Answer
  • LPD
  • OSPF
  • BGP
  • Static Routing

Question 39

Question
Router R5 receives four route updates for the same prefix. Which of the four routes will be installed in R5’s routing table?
Answer
  • Routes learned from R1
  • Routes learned from R2
  • Routes learned from R3
  • Routes learned from R4

Question 40

Question
Router R5 receives four route updates for the same prefix. Which of the four routes will be installed in R5’s routing table?
Answer
  • Route learned from router R1
  • Route learned from router R2
  • Route learned from router R3
  • Route learned from router R4

Question 41

Question
Which of the following about a static route in an Nokia 7750 SR is FALSE?
Answer
  • It is manually configured by an administrator
  • It is preferred over dynamic protocols by default
  • It changes dynamically if the topology changes
  • It can be used for routing within the same autonomous system

Question 42

Question
When configuring a static route on router R2, what next hop address should be used to reach a host on 192.168.1.0/27?
Answer
  • 10.1.1.1
  • 10.1.1.2
  • 10.2.3.2
  • 10.2.3.3

Question 43

Question
Which of the following about an IP filter in an Nokia 7750 SR is FALSE?
Answer
  • It is also known as an Access Control List (ACL).
  • It is applied to all interfaces by default.
  • It can be used to filter traffic based on IP addresses.
  • It can be applied to egress traffic.

Question 44

Question
Which of the following about the displayed IP filter on an Nokia 7750 SR is TRUE?
Answer
  • It discards traffic from network 1.2.3.0/24.
  • It discards traffic to network 1.2.3.0/24.
  • It discards all traffic except the traffic from network 1.2.3.0/24.
  • It discards all traffic except the traffic to network 1.2.3.0/24.

Question 45

Question
Which of the following about a router running a link state routing protocol is FALSE?
Answer
  • It uses an SPF algorithm to calculate the routing table.
  • Route updates are driven by topology changes.
  • It sends copies of the routing table to neighbour routers.
  • It has a view of the entire network topology

Question 46

Question
Which routing protocol uses hop count for path selection?
Answer
  • OSPF
  • RIPv2
  • IS-IS
  • Static Routing

Question 47

Question
Which routing protocol is best used to provide routing between autonomous systems?
Answer
  • OSPF
  • IS-IS
  • RIPv2
  • BGP

Question 48

Question
Which of the following about the OSPF routing protocol is TRUE?
Answer
  • It is a distance vector protocol.
  • It uses SPF algorithm for route selection.
  • It uses hop count to determine metric value.
  • It is used for routing between different autonomous sytems.

Question 49

Question
Which of the following is used by OSPF to identify the most up-to-date routing information?
Answer
  • Priority value in the Hello packet.
  • Age in the Link State Advertisement.
  • Master/slave status in the Database Description packet.
  • Sequence number in the Link State Advertisement

Question 50

Question
Which of the following about BGP is FALSE?
Answer
  • It is a link state protocol.
  • It uses TCP sessions to establish BGP peering.
  • It can be used for routing within an autonomous system.
  • It can be used for routing between autonomous systems.

Question 51

Question
Which of the following about autonomous systems is FALSE?
Answer
  • AS numbers can be assigned by RIRs.
  • AS numbers can be assigned by ISPs.
  • Private AS numbers are advertised on the Internet.
  • eBGP is used between different autonomous systems.

Question 52

Question
Which of the following is TRUE about a CE router that is involved in a VPN service?
Answer
  • It is aware of the VPN services provided by the service provider.
  • It resides on the service provider premises.
  • It connects to at least one PE router.
  • It connects to at least one CE router.

Question 53

Question
What is the function of a SAP?
Answer
  • It provides a P device with service access.
  • It provides a CE device with service access.
  • It binds the service to an MPLS service tunnel.
  • It binds the service to an MPLS transport tunnel.

Question 54

Question
Which of the following about the service label is FALSE?
Answer
  • The ingress PE device encapsulates customer data with a service label.
  • A service label identifies the service that data belongs to.
  • The egress PE device strips the service labels and forwards unlabeled packets.
  • A P device performs a service label swap operation.

Question 55

Question
Which device adds MPLS labels to packets that enter a service provider network?
Answer
  • CE
  • P
  • iLER
  • eLER

Question 56

Question
Which of the following about VPWS is FALSE?
Answer
  • VPWS is a Layer 2 service.
  • VPWS emulates a single leased line between two locations.
  • Each VPWS maintains a MAC FDB.
  • VPWS customers do not have knowledge of the service provider network.

Question 57

Question
Which of the following about VPLS is FALSE?
Answer
  • VPLS is a Layer 2 service.
  • VPLS emulates a switched Ethernet service.
  • VPLS customers don’t have knowledge of the service provider network.
  • Each PE maintains a VRF instance for each VPLS.

Question 58

Question
Which device is the termination point of a Label Switched Path (LSP)?
Answer
  • CE
  • P
  • iLER
  • eLER

Question 59

Question
What operation is performed by an iLER when it receives a packet?
Answer
  • It pushes a new MPLS label and forwards the packet to the next LSR.
  • It swaps the MPLS albel and forwards the packet to the next LSR.
  • It forwards the packet to the next LSR without altering the MPLS label.
  • It pops the MPLS label and forwards the packet to the next IP router.

Question 60

Question
Which of the following devices performs a label swap operation?
Answer
  • LSR
  • iLER
  • eLER
  • CE
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