4A0-100 Sample Questions Answers

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.

Half-duplex transmission is less efficient because the frame MTU is smaller.

An end-station connected to a hub will always be half-duplex.

Ethernet switches only support half-duplex transmission.

All of the above.

Sequence numbers are used to ensure that the data received is offered to the application in the correct order.

The SYN flag is used to identify congestion in the network.

The NACK flag is set on confirmation segments to acknowledge FCS errors.

The window size is transmitted in all TCP segments to communicate MTU limitations of lower layer protocols to upper layer applications.

Inability to perform switch to switch redundancy using multiple connections at Layer 2.

Missing protocol field in Ethernet II required to identify redundancy protocols at Layer 2.

Missing packet sequencing in Layer 2 Ethernet required to re-order packets on arrival.

Inability to forward multicast frames without a routing protocol.

0.0.0.0/0 next-hop 10.2 3.2

0.0.0.0/32 next-hop 10.2.3.2

10.2.3.2/32 next-hop 0.0.0.0/0

0.0.0.0/0 next-hop 192.168.2.0

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

Routers send frequent periodic updates to the entire network.

Routers know the entire network topology.

Routers use hop-count to calculate their routing tables.

IANA

IETF

RIR

IEEE

Segmenting

Stacking

Routing

Tagging

Well known ports apply to routers only and are used for communication and control traffic. Well known port numbers are assigned by IANA and can have any value.

Well known ports are used by TCP and UDP. Well known port numbers range from 1024 to 65535 and are assigned by IANA.

Well known port numbers are used by both TCP and UDP. Well known port numbers range from 1 to 1023 and are assigned by IANA.

Well known ports numbers are used by TCP only. Well known port numbers are assigned by IANA and can have any value.

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.

An entry included in the default configuration of the router that is used if no dynamic routing protocols or static routes are configured.

A wildcard entry used when the destination network is not specifically defined in the routing table.

An entry selected based on the route that has the least cost to the destination (path with the most physical bandwidth)

An entry used by the routing protocol when it is unable to calculate the best route to the destination.

Route learned from router R1.

Route learned from router R2.

Router learned from router R3.

Route learned from router R4.

The Internet is a global and distributed network.

The Internet is a network owned by Tier 1 service providers.

The Internet is an open network of networks.

The Internet is a network that is advertised across the globe.

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

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

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

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

1

2

5

6

Building routing tables using dynamic routing protocols.

Building forwarding tables for the IOMs.

Handling router configuration and management functions.

Processing and forwarding user application traffic.

By allowing a block of routes to be represented by one route.

By only keeping best routes in the routing table.

By rejecting duplicate route advertisements.

By not advertising directly connected routes.

The router consults the forwarding table on the ingress IOM.

The router looks for a longest match to the destination IP address.

The router resolves the next-hop address of the matching route to a physical interface.

If there is no match in the forwarding table, the router sends a “No route to destination” notification.

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.

Anycast.

Multicast.

Broadcast.

Unicast.

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.

Contains all the components required to configure and run protocols on the Nokia 7750 SR/7450 ESS.

Loads the router configuration.

Transfers the router configuration from the router to the network management system.

Loads the router software image.

172.16.224.255/18

255.255.255.255/32

224.1.2.1/8

192.168.24.59/30

Secure transmission of information.

Enforcing a constant packet size to avoid discards.

Allowing remote logins.

Providing host to host connectivity with global addressing.

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.

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.

5 Mbps.

10 Mbps.

15 Mbps.

20 Mbps.

If dynamic-cost is enabled it will adjust the cost for routing protocols such as OSPF.

If dynamic-cost is not enabled it will adjust the cost for routing protocols such as OSPF by dividing the link bandwidth by 2.

The LAG will be changed to an operational state of 'down'.

The LAG will function with only 2 ports. There will be no change to the routing metric.

100 m.

500 m.

1 Km.

10 Km.

Classful IP addressing provides hierarchy based on variable subnet masks.

Classless IP addresses provide hierarchy based on a variable length subnet mask.

Classless IP addresses provide hierarchy based on fixed subnet masks of /24. /16 and/8.

IP addresses provide hierarchy based on the country code and regional identifier.

File sizes

Port statistics

Log-id 100 files

TiMOS image files

At the edge of the provider's network facing the customer.

At the edge of the customer's network facing the provider.

In the core of the provider's network.

On the customer premises.

VPWS is a point-to-multipoint service.

VPWS requires MAC learning in order to forward frames to the correct destination

A Spanning Tree Protocol must be enabled when deploying a VPWS.

VPWS treats multicast traffic similar to unicast traffic.

TTL

ACK

FIN

SYN

TCP port 179.

UDP port 179.

TCP port 22.

UDP port 22.

next-hop 10.2.3.2

next-hop 192.168.2.1

next-hop 10.2 3.1

next-hop 192.168.2.0

OSPF is a link state protocol with fast convergence.

OSPF supports hierarchy with multiple areas.

The default metric for OSPF is hop count.

OSPF does not support VLSM.

OSPF supports neighbor authentication.

True

False

Ethernet

ATM

Token Ring

Frame Relay

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.

IP forwarding

IP decapsulation

IP encapsulation

IP tunneling

Cost

Round-trip time

Hop-count

Route preference

AAL1

AAL2

AAL3/4

AAL5

eBGP peering sessions with routers R1, R3 and R4

iBGP peering sessions with routers R1 and R5

An eBGP peering session with router R1, and iBGP peering sessions with routers R3 and R4

An iBGP peering session with router R1, and an eBGP peering session with router R4

ICMP echo request, ARP request, ARP reply, ICMP echo reply

ARP request, ARP reply, ICMP echo request, ICMP echo reply

ICMP echo request, ICMP echo reply, ARP request, ARP reply

ICMP echo request. ARP reply, ARP request, ICMP echo reply

/25

/26

/28

/30

A group of routers that are under one administrative authority.

A group of networks that make up the Internet.

A group of networks from different organizations exchanging routes using IGP routing protocols.

Any organization that has a connection to the Internet.

It reduces the number of routes advertised by the router.

It allows a single route table entry to represent multiple subnetworks

It can reduce the size of the routing table in neighboring routers.

It advertises more specific routes for routing advertisement stability.

Private

Global

Read-only

Exclusive