NRS-1 Questions

Question

Which of the following is the physical infrastructure that provides interconnections between ISPs?

Answer 1

demarcation point

Answer 2

An Internet exchange point

Answer 3

A central office

Answer 4

A point of presence

Answer 5

A provider edge router

Answer 6

An Internet exchange point

Answer 7

A demarcation point

Answer 8

A point of presence

Answer 9

The application services layer

Answer 10

The transport layer

Answer 11

The Internet protocol layer

Answer 12

The network interface layer

Answer 13

Source and destination MAC addresses

Answer 14

Source and destination IP addresses

Answer 15

Source and destination port numbers

Answer 16

Source and destination email addresses

Answer 17

SF/CPM -> MDA -> IOM -> SFP

Answer 18

SF/CPM -> SFP -> IOM -> MDA

Answer 19

SF/CPM -> IOM -> MDA -> SFP

Answer 20

MDA -> IOM -> SF/CPM -> SFP

Answer 21

Using CF 1 to store debug logs.

Answer 22

Using CF 2 to store debug logs.

Answer 23

Using CF 3 to store accounting logs.

Answer 24

Using CF 3 to store system files.

Answer 25

Point-to-point network

Answer 26

Circuit-based network

Answer 27

Virtual private routed network

Answer 28

Shared network

Answer 29

SONET/SDH is a Layer-1 technology

Answer 30

SDH is used primarily in North America

Answer 31

The basic SONET frame is the STS-1.

Answer 32

An STS-1 frame is exactly one third of an STM-1 frame

Answer 33

Start Frame Delimiter

Answer 34

Source address

Answer 35

It performs signal amplification.

Answer 36

It replicates Ethernet frames across all ports except the receiving port.

Answer 37

It inspects Layer 2 frame headers.

Answer 38

It operates in half-duplex mode.

Answer 39

The destination MAC address is saved in the MAC FDB, and the frame is discarded.

Answer 40

The destination MAC address is saved in the MAC FDB, and the frame is flooded to all ports except the receiving port.

Answer 41

The source MAC address is saved in the MAC FDB, and the frame is discarded.

Answer 42

The source MAC address is saved in the MAC FDB, and the frame is flooded to all ports except the receiving port.

Answer 43

2 broadcast domains, 7 collision domains

Answer 44

2 broadcast domains, 9 collision domains

Answer 45

3 broadcast domains, 7 collision domains

Answer 46

3 broadcast domains, 9 collision domains

Answer 47

7 broadcast domains, 9 collision domains

Answer 48

It aggregates physical links between devices

Answer 49

It provides point-to-point redundancy between devices.

Answer 50

It supports auto-negotiation on ports in the LAG

Answer 51

It improves performance by increasing bandwidth between devices.

Answer 52

The switch will flood the frames on ports 1 to 4.

Answer 53

The switch will flood the frames on ports 2 to 4.

Answer 54

The switch will flood the frames on ports 5 to 8.

Answer 55

The switch will flood the frames on ports 2 to 8.

Answer 56

It allows a service provider to support customers that use overlapping VLAN IDs.

Answer 57

It increases the number of VLANs a service provider can support.

Answer 58

It increases the size of the VLAN ID field in the Ethernet header.

Answer 59

It allows a service provider to add another VLAN tag to traffic.

Answer 60

Type of Service

Answer 61

Identification

Answer 62

Network address

Answer 63

Broadcast address

Answer 64

Multicast address

Answer 65

Anycast address

Answer 66

It creates a two-level address hierarchy.

Answer 67

It increases the number of IP addresses available in the Internet.

Answer 68

It supports route summarization to reduce routing table size.

Answer 69

It supports subnetting to divide a network into smaller networks.

Answer 70

172.16.176.255

Answer 71

172.16.191.255

Answer 72

172.16.255.255

Answer 73

172.255.255.255

Answer 74

It is a loopback address.

Answer 75

It has a fixed prefix value of /32.

Answer 76

It is manually configured by an operator.

Answer 77

It is associated with the management port.

Answer 78

It summarizes subnet addresses into classful addresses.

Answer 79

It maps multiple private IP addresses into one public IP address.

Answer 80

It divides a network into multiple subnets.

Answer 81

It reduces the number of route advertisements within a network.

Answer 82

134.234.123.0/25

Answer 83

134.234.123.0/24

Answer 84

134.234.123.128/24

Answer 85

134.234.122.0/23

Answer 86

Perform longest match lookup for the destination IP address.

Answer 87

Perform MAC address learning.

Answer 88

Push traffic through the switch fabric.

Answer 89

Identify physical egress interface.

Answer 90

Acknowledgement

Answer 91

A unicast message

Answer 92

A broadcast message

Answer 93

A multicast message

Answer 94

An anycast message

Answer 95

ICMP is used to resolve a MAC address for a given IP address.

Answer 96

ICMP messages are generated by Ethernet switches.

Answer 97

ICMP messages are encapsulated within IP datagrams.

Answer 98

ICMP relies on the CSMA/CD algorithm

Answer 99

The routing table is maintained by the CPM

Answer 100

The routing table contains next-hop information

Answer 101

The routing table is used in the MPLS data plane

Answer 102

The routing table is used to construct a forwarding table

Answer 103

Static Routing

Answer 104

Routes learned from R1

Answer 105

Routes learned from R2

Answer 106

Routes learned from R3

Answer 107

Routes learned from R4

Answer 108

Route learned from router R1

Answer 109

Route learned from router R2

Answer 110

Route learned from router R3

Answer 111

Route learned from router R4

Answer 112

It is manually configured by an administrator

Answer 113

It is preferred over dynamic protocols by default

Answer 114

It changes dynamically if the topology changes

Answer 115

It can be used for routing within the same autonomous system

Answer 116

It is also known as an Access Control List (ACL).

Answer 117

It is applied to all interfaces by default.

Answer 118

It can be used to filter traffic based on IP addresses.

Answer 119

It can be applied to egress traffic.

Answer 120

It discards traffic from network 1.2.3.0/24.

Answer 121

It discards traffic to network 1.2.3.0/24.

Answer 122

It discards all traffic except the traffic from network 1.2.3.0/24.

Answer 123

It discards all traffic except the traffic to network 1.2.3.0/24.

Answer 124

It uses an SPF algorithm to calculate the routing table.

Answer 125

Route updates are driven by topology changes.

Answer 126

It sends copies of the routing table to neighbour routers.

Answer 127

It has a view of the entire network topology

Answer 128

Static Routing

Answer 129

It is a distance vector protocol.

Answer 130

It uses SPF algorithm for route selection.

Answer 131

It uses hop count to determine metric value.

Answer 132

It is used for routing between different autonomous sytems.

Answer 133

Priority value in the Hello packet.

Answer 134

Age in the Link State Advertisement.

Answer 135

Master/slave status in the Database Description packet.

Answer 136

Sequence number in the Link State Advertisement

Answer 137

It is a link state protocol.

Answer 138

It uses TCP sessions to establish BGP peering.

Answer 139

It can be used for routing within an autonomous system.

Answer 140

It can be used for routing between autonomous systems.

Answer 141

AS numbers can be assigned by RIRs.

Answer 142

AS numbers can be assigned by ISPs.

Answer 143

Private AS numbers are advertised on the Internet.

Answer 144

eBGP is used between different autonomous systems.

Answer 145

It is aware of the VPN services provided by the service provider.

Answer 146

It resides on the service provider premises.

Answer 147

It connects to at least one PE router.

Answer 148

It connects to at least one CE router.

Answer 149

It provides a P device with service access.

Answer 150

It provides a CE device with service access.

Answer 151

It binds the service to an MPLS service tunnel.

Answer 152

It binds the service to an MPLS transport tunnel.

Answer 153

The ingress PE device encapsulates customer data with a service label.

Answer 154

A service label identifies the service that data belongs to.

Answer 155

The egress PE device strips the service labels and forwards unlabeled packets.

Answer 156

A P device performs a service label swap operation.

Answer 157

VPWS is a Layer 2 service.

Answer 158

VPWS emulates a single leased line between two locations.

Answer 159

Each VPWS maintains a MAC FDB.

Answer 160

VPWS customers do not have knowledge of the service provider network.

Answer 161

VPLS is a Layer 2 service.

Answer 162

VPLS emulates a switched Ethernet service.

Answer 163

VPLS customers don’t have knowledge of the service provider network.

Answer 164

Each PE maintains a VRF instance for each VPLS.

Answer 165

It pushes a new MPLS label and forwards the packet to the next LSR.

Answer 166

It swaps the MPLS albel and forwards the packet to the next LSR.

Answer 167

It forwards the packet to the next LSR without altering the MPLS label.

Answer 168

It pops the MPLS label and forwards the packet to the next IP router.

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NRS-1 Questions

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