4A0-100 Practice Exam Questions with Answers Nokia Scalable IP Networks Certification

The Media Dependent Adapter (MDA)

The Input/ Output Module (IOM)

The Switch Fabric (SF)

The Control Processor Module (CPM)

True

False

Link bandwidth.

Round trip time.

Hop count.

Route preference.

Responds in real time to network failures.

Can only be used for routing within an autonomous system.

Uses a hop-count metric to determine the best route to a network.

Explicitly defines the next-hop based on operator input.

Real-time audio application such as VoIP.

Web browser.

Email application.

Telnet.

RTM selects the best route from among multiple routing protocols.

RTM selects the best route using the metric as criteria

RTM sends its best route to all its directly connected neighbors.

RTM installs its best route in the routing table.

Routers periodically send a copy of their routing table to their neighbors.

Routers flood link information throughout the entire area.

Network converges quickly (within several seconds) after a topology change.

Routers do not have precise knowledge of the entire network topology.

An application and session layer.

A network layer that provides a universal and consistent forwarding service.

A transport layer with two protocols.

An applications services layer with similar layering and service definitions.

Provides a universal addressing scheme to uniquely identify destinations in the network.

The size of the Layer 2 frame cannot exceed 1518 bytes.

Provides error checking of the frame contents after transmission.

All the above.

R3 discards the LSA received from R1 and sends a copy of the LSA from its link state base to R1.

R3 installs the LSA received from R1 in its link state database and floods a copy to its neighbors.

R3 discards the LSA received from R1 and sends an ACK to R1.

R3 installs the LSA received from R1 in its link state database, sends an ACK to R1 and floods a copy to its neighbors.

TCP port 179.

UDP port 179.

TCP port 22.

UDP port 22.

It restricts the sender from sending too much data when there is congestion in the network.

It allows the receiver to control the rate at which the sender transmits data.

It forces the sender to send only one segment at a time.

It allows the receiver to drop segments without the sender having to retransmit.

Real-time audio application, such as VoIP

Web browser

Email application

Telnet

A passive device simply used to connect two or more cables. It does not generate or amplify any signals.

A device that receives and retransmits a signal out its ports but does not do any Layer 2 analysis of the data.

A device that receives a signal and based on the Layer 2 destination address, makes a decision on which ports the signal should be retransmitted.

A device that receives a signal and based on the Layer 3 destination address makes a decision on which ports the signal should be retransmitted.

Customer traffic is encapsulated with a service label by the ingress PE. The service label identifies which transport tunnel to use.

Customer traffic is encapsulated with a service label by the egress PE. The service label identifies which transport tunnel to use.

Customer traffic is encapsulated with a service label by the egress PE. The service label identifies the specific service the data belongs to.

Customer traffic is encapsulated with a service label by the ingress PE. The service label identifies the specific service the data belongs to.

R7 silently discards the LSA received from R8.

R7 installs the LSA received from R8 in its link state database and floods a copy to its neighbors.

R7 discards the LSA received from R8 and sends an ACK to R8.

R7 installs the LSA received from R8 in its link state database, sends an ACK to R8 and floods a copy to its neighbors.

172.16.9.0/24 next-hop 10.10.10.1

172.16.9.0/24 next-hop 10.10.10.2

172.16.9.0.24 next-hop 10.10.10.3

Any of the above

Preference

Metric

Dest prefix

Next-hop

Cost

Interface MTU.

Area ID.

Authentication password.

Hello interval.

Dead interval.

Router priority.

VPWS Virtual Private Wire Service

VPLS Virtual Private LAN Service.

VPRN Virtual Private Routed Networks.

MLPPP Multi-link Point-to-Point protocol

VPDFS Virtual Private Dark Fiber Service.

config router static-route 192.168.2.0/24 next-hop 10.2.3.2

config router static-route 10.2.3.1 next-hop 192.168.2.0

config router static-route 192.168.2.0/24 next-hop 10.2.3.1

config router static-route 10.2.3.2 next-hop 192.168.2.0

The missing segment is retransmitted.

The TCP session is terminated.

The sender sends the next segment.

An ICMP destination unreachable message is sent.

Ethernet

ATM

Token Ring

Frame Relay

To select the best route from among multiple routing protocols.

To select the best route using the metric as criteria.

To send its best route to all its directly connected neighbors.

To install its best route in the routing table.

A VPLS operates as if 2 sites are directly connected by a single cable.

A VPLS operates as if multiple sites are connected through a single switched LAN.

A VPLS operates as if multiple sites are connected through a single router.

A VPLS operates as if multiple sites are connected through a series of private point-to-point routed connections.

Broadcast storms caused by redundancy in Layer 2 networks.

Missing protocol field in the Ethernet header.

Missing sequence number in the Ethernet header.

Unreliable data transfer in Layer 2 networks.

10.10.10.0

10.10.10.1

10.10.10.2

10.10.10.3

Router R1

Router R2

Router R3

Router R4

Console

Session

Memory

File

Private

Global

Read-only

Exclusive

208.40.224.16/28

208.40.224.32/28

208.40.224.48/28

208.40.224.64/28

Configuration changes are stored in a candidate configuration datastore.

A router uses the running configuration datastore for its operation.

Configuration changes are activated by committing the candidate configuration.

A running configuration datastore consists of multiple candidate configuration datastores.

The subnet has only one address reserved for a loopback interface or the system interface.

The subnet has a broadcast address.

The subnet is configured for a point-to point link.

The subnet is reserved for a multicast address groups.

IP filters can be applied on inbound traffic, outbound traffic, or both.

IP filters can be created to filter based on IP and MAC addressing.

By default, no IP filter is applied to an interface.

The default action of an IP filter is to forward packets.

MAC address of the default gateway.

IP addresses of other DHCP clients.

IP addresses offered to the client.

IP addresses of all DHCP servers.

An IP filter is used to discard packets with checksum errors.

An IP filter can allow IP packets into a network or deny IP packets from entering a network.

Multiple ingress and egress filter policies can be applied to a network interface.

Once an IP filter is applied, it cannot be modified.

Unicast

Multicast

Broadcast

Anycast

System interface

Interface “toC1”

Interface “toP1”

Interface “toP2”

Provides a connectionless delivery service.

Provides a connection oriented delivery service

Provides an unreliable transmission service,

Provides a reliable transmission service.

Preference

Metric

Next-hop

Cost

Both ARP request and response messages are unicast messages.

Both ARP request and response messages are broadcast messages.

An ARP request is a broadcast message, while an ARP response is a unicast message.

An ARP request is a unicast message, while an ARP response is a broadcast message.

10.10.10.0

10.10.10.1

10.10.10.2

10.10.10.3

An Internet content provider

An Internet service provider

An enterprise

A regional Internet registry

Source and destination MAC addresses

Source and destination IP addresses

Source and destination port numbers

Source and destination email addresses

Broadcast storms caused by redundancy in Layer 2 networks.

Missing protocol field in the Ethernet header.

Missing sequence number in the Ethernet header.

Unreliable data transfer in Layer 2 networks.

The ingress LER

The CE device

The P router

The egress LER

PPP supports multipoint access networks with many stations. The all 1's acts as a broadcast.

PPP supports multipoint access networks with many stations. The all 1's acts as a multicast.

PPP supports point-to-point networks only. The address field is fixed.

PPP supports point-to-point networks only. The address field can change dynamically since every station is assigned a PPP address.

OSPF

BGP

X.500

IS-IS

Ethernet

When the router first receives a frame from a LAN.

After the forwarding table is checked.

After the IP datagram is extracted from the L2 frame.

Immediately before the IP packet is encapsulated for transmission.

Ethernet.

Token-Ring.

SONET/SDH.

E1 carrier.

PPP

The LSR refers to its routing table and forwards the packet to the next LSR or LER without altering the MPLS label.

The LSR refers to its MPLS label table, swaps the label and forwards the packet to the next LSR or LER.

The LSR refers to its MPLS label table forwards the packet to the next LSR or LER without altering the MPLS label.

The LSR refers to its MPLS label table, pops the label and forwards the packet to the next IP router.

IGP

IBGP

EBGP

EGP

BGP cannot be run between routers in the same AS.

The ACK tells the host A that host B wishes to establish a session.

The ACK tells host A the sequence number of the segment that was just received by host B.

The ACK tells host A the sequence number of the next segment that host B expects to see.

The ACK is flow control from host B and tells host A to reduce its transmission rate.

The combination of IP source and destination address and TCP source and destination port uniquely identifies each session.

The combination of IP source and destination address and the IP protocol field uniquely identifies each session.

The hosts can identify the sessions using each others MAC addresses.

Two hosts can not have multiple TCP sessions simultaneously.

Ethernet.

ATM.

Frame Relay.

Token Ring.

BGP is an exterior gateway protocol.

BGP routing is based on distance vector.

BGP sends periodic updates to its neighbors.

A router running BGP protocol needs an Autonomous system number

Virtual Private Wire Service .

Virtual Private LAN Service.

Virtual Private Routed Networks.

Virtual Private Dark Fiber Service.

The Service ATM Point is used for ATM connections to a PE.

The Service Access Point is defined on the PE device and is the customers access to the service.

The Service Access Point is defined on the P device and is the customers access to the service.

The Service Access Point is defined on the CE device and is the customers access to the service.

Responds in real time to network failures.

Can only be used for routing within an autonomous system.

Uses a hop-count metric to determine the best route to a network.

Explicitly defines the next hop based on operator input.

Virtual Private Wire Service

Virtual Private LAN Service

Virtual Private Routed Networks

Virtual Private Dark Fibre Service

TTL

ACK

FIN

SYN

config router static-route 0.0.0.0/0 next-hop 10.2.3.2

config router static-route 0.0.0.0 next-hop 10.2.3.2

config router static-route 10.2.3.2 next-hop 0.0.0.0/0

config router default-route 10.2.3.2

config router static-route 0.0.0.0 next-hop 192.168.2.0

RSVP-TE

CSPF

PNNI

LDP

The primary purpose of TCP is to provide reliable communications between application services.

The primary purpose of TCP is to provide unreliable communications between application services

The primary purpose of TCP is to provide IP routing between application services.

The primary purpose of TCP is to define the correct format for the application layer such as JPEG or HTML.

116.14.17.16

116.14.17.31

116.14.17.192

116.14.17.189

There must be multiple ports assigned to the LAG.

All ports in the LAG must be configured with the same characteristics.

Auto-negotiation must be enabled on all ports in the LAG.

All of the above.

Support for IPv6.

Support for POS.

Upgrade path to the Nokia 7750 SR.

Support for IS-IS

2b:28

00-20

ce-2b:28

00-20-60

POS

IP

ATM

Frame Relay

Ethernet

9 broadcast domains, 3 collision domains.

3 broadcast domains, 3 collision domains.

3 broadcast domains, 9 collision domains.

1 broadcast domain, 9 collision domains.

Destination address

Frame check sequence

Preamble

Length field

A VLAN allows multiple Ethernet switches to be connected in a single broadcast domain.

A VLAN allows multiple Ethernet switches to be connected in a single collision domain.

A VLAN can separate ports on the same switch into different broadcast domains.

A VLAN can separate ports on the same switch into different collision domains.

Internet devices on the same network can have the same Layer 3 address in different broadcast domains.

Every Host device must have a unique Layer 3 address in order to access the Internet.

Internet devices need unique Layer 3 addresses to communicate directly with upper layers.

A router must have only one address to allow it to be uniquely identified.

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tab character

space character

info

ATM and Frame-Relay are circuit switched protocols and use Virtual Circuits to create logical separation of traffic.

ATM and Frame-Relay are point-to-point protocols and do not support different customers or traffic type on the same physical wire.

ATM and Frame-Relay are circuit switched protocols and use VLAN's to create logical separation of traffic.

ATM and Frame-Relay are circuit switched protocols and use IP Header information to create logical separation of traffic.

Devices on different VLANs cannot communicate with each other.

Devices on different VLANs can communicate with each other as long as they are connected to the same switch.

Devices on different VLANs can communicate with each other as long as the switches they are attached to are connected to each other with an Ethernet connection.

Devices on different VLANs can communicate with each other if there is an IP router to connect the VLANs.

time-display

help

type

terminal

A physical interface address.

A logical address on the router not corresponding to any specific interface.

May have any prefix value.

A management IP address.

172.16.224.255/18

255.255.255.255/32

224.1.2.1/8

192.168.24.59/30

A large corporation.

An ISP.

A home based business.

A content provider.

The internet emerged in the commercial world in the 1980’s following the US military’s adoption of TCP/IP in 1983.

The internet evolved from a military to a research to a commercial based network.

The internet remained primarily a research based network and was only commercially adopted in 2000 when the world wide web was conceived.

Internet service providers provided the services necessary for military based networks to evolve into research and education based networks.

Allowing a contiguous block of network addresses to be represented by one network prefix.

Increasing the number of addresses in the routing table.

Summarizing addresses in the network into smaller routing tables.

Not advertising directly connected routes.

ARPANET was an early packet switched network initially connecting 4 sites (Stanford, UC Santa Barbara, UCLA, and U of Utah).

The mission of ARPANET was to connect packet switched networks and other diverse networks, making an international network of networks.

ARPANET connected sites spread around the Hawaiian Islands to a central time-sharing computer on the University of Hawaii campus.

ARPANET was based on the use of TCP/IP to interconnect diverse systems.

Same host numbers.

Same IP address.

First two bits of the IP address are set to 01.

Same network prefix.

255.255.0.0

255.255.128.0

255.255.224.0

255.255.254.0

Controls distribution of IP addresses.

Simplifies protocol functionality.

Isolates changes in lower layers from upper layers.

Increases protocol operational efficiencies.

Layering adds to the fragmentation of the data

The MDA contains the flexible fast path complex used for forwarding data.

Excess data is discarded by the MDA and the remaining data forwarded for QoS processing.

The MDA buffers data and applies Quality of Service (QoS) to classify and treat the data appropriately.

The MDA converts data from its incoming physical format into an internal format and provides some minimal buffering.

It forwards the data to the switch fabric.

It discards excess data packets.

It converts the incoming data to an internal format.

It performs Quality of Service operations and buffers incoming data.

Routers send a copy of their routing table to their neighbors periodically.

Routers flood link information throughout the entire area.

Network converges quickly (within several seconds) after a topology change.

Routers do not have precise knowledge of the entire network topology.

IBM.

US Military.

Nokia.

NASA.

Bell Labs

STM-1 with a bit rate of 1.544 Mbit/s

STM-1 with a bit rate of 2.048 Mbit/s

STM-1 with a bit rate of 51.84 Mbit/s

STM-1 with a bit rate of 155.52 Mbit/s

Main

Security

Syslog

Debug

The allocation of enterprise IP address space

The allocation of residential IP address space

The allocation of global IP address space

The allocation of North American IP address space

It can boot without a compact flash in the CF3 slot.

It cannot boot without a compact flash in the CF3 slot.

It can operate without a compact flash in the CF3 slot once it has booted.

It cannot operate without a compact flash in the CF3 slot once it has booted.

The cost must be statically configured on all ports in the LAG.

The speed and duplex setting on all ports in the LAG must be the same.

Auto-negotiation must be enabled on all ports in the LAG.

The duplex setting on all the ports in the LAG must be forced to half.

172.16.9.0/24 next-hop 10.10.10.1

172.16.9.0/24 next-hop 10.10.10.2

172.16.9.0.24 next-hop 10.10 10 3

0.0.0.0/32 next-hop 172.16.9.1

Route learned from router R1.

Route learned from router R2.

Router learned from router R3.

Route learned from router R4.

Layer 2 is responsible for encapsulating packets into frames for transmission on physical media.

Layer 2 is responsible for encapsulating packets into IP datagrams and routing them.

Layer 2 is responsible for encapsulating application data into TCP/UDP messages.

Layer 2 is responsible for the timing of the signals on physical media.

the application services layer

The transport layer

The Internet protocol layer

The network interface layer

The Media Dependent Adapter (MDA)

The Input/ Output Module (IOM)

The eXpandable Media Adapter (XMA)

The Control Processor Module (CPM)