4A0-C01 Sample Questions Answers

The system ID

The loopback address

The sequence number of the hello packet

The device that first initiated communication becomes the DIS

The router with the lowest priority is the DR.

The router with the highest priority is the DR.

If priorities are the same, the DR is chosen based on the lowest RID.

If priorities are the same, the DR is chosen based on the highest RID.

True

False

Priority of 0

Priority of 1

Priority of 64

Priority of 255

Different types of Hello packets are exchanged on point-to-point networks than on broadcast networks.

L1/L2 Hello packets are exchanged on broadcast links.

Different L1 and L2 Hello packets are exchanged on broadcast links.

By default, Hello packets are sent every 5 seconds, and the timeout to declare a neighbor down is 15 seconds.

Router LSA

AS External LSA

Intra-Area Prefix LSA

Inter-Area Prefix LSA

Network LSA

None of the statements are correct.

There are three types of LSPs: L1, L2 and L1/L2.

An LSP packet contains the ATT bits and the IS-type bits.

The lower the LSP sequence number, the more current the update.

Separate databases are maintained for L1 „ L2, and L1/L2 LSPs.

Broadcast

Non-broadcast multi-access

Point-to-point

Point-to-multipoint

Metric is cost based

Slow convergence

Automatic summarization

Support CIDR

They are sent using multicast MAC addresses 0180:0200:0014.

They are sent using multicast MAC addresses 0180:c200:0015.

They are sent using a unicast address.

None of the above.

Add the "originate-default-route" option in the NSSA area configuration on router R3

Add the "summaries" option to the NSSA area configuration on router R1

Make a static route on router R1 to 192.168.3.1

Make a default route on router R2

RIPv2-TE

CSPF

OSPF-TE

ISIS-TE

RSVP-TE

Normal

Stub

Totally stubby

Totally NSSA

Service tunnels are unidirectional.

Transport tunnels are unidirectional.

A service will use the same service label for every hop.

A local service requires a transport tunnel.

The router performs a unidirectional LSP test.

The router collects hop information along the tunnel's path.

The router uses MPLS Echo Request packets that are IP-routed,

The MPLS TTL values are incremented at each request.

Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3- R2-R5-R6).

Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R2-R5-R6).

Router R6 to router R3 will follow (R6-R5-R2-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).

Router R6 to router R3 will follow (R6-R5-R7-R4-R3). Router R3 to router R6 will follow (R3-R4-R7-R5-R6).

To test the ability of reaching the far-end IP address of an SDP within the SDP encapsulation

To determine the path MTU to the far-end IP address over an SDP.

To determine the service MTU of the service using an SDP.

To determine the presence of hosts using the service

Route distinguishes are 12 bytes in length

Route distinguishes are appended to IPv4 prefixes to form 16 byte VPN-IFV1 prefixes.

Route distinguishes are used to determine which routes a VPRN should import.

CE routes must be configured with the proper route distinguishes for the VPRN they are associated to

All of the above statements are true.

All of the above statements are false.

sdp-ping

Isp-ping

sap-ping

svc-ping

RRO is used to report the protection tunnel status to the head-end router.

RRO contains the MP information that is required by a PLR for facility protection.

RRO contains the label information that is expected by an MP for facility protection.

RRO is used to inform downstream routers about the protection type requested.

The time router R4 takes to send a PATH Error message toward the head-end router.

The time router R4 takes to detect RSVP Hello message timeout from router R6.

The time router R4 takes to send a RESV Error message to the head-end router.

The time router R1 takes to signal an alternate path through router R3.

All routers along the path, R1, R2, and R3 can be PLRs.

If the R1-R2 link fails, router R4 becomes an MP.

If the R2-R3 link fails, router R3 becomes a PLR.

Router R1 is the LSP head-end and can be a PLR.

The outer label TTL will be 249 and the inner label TTL will be 250.

The outer label TTL will be 249 and the inner label TTL will be 251.

The outer label TTL will be 251 and the inner label TTL will be 251.

The outer label TTL will be 251 and the inner label TTL will be 252.

A transport tunnel can carry many service tunnels.

The transport label is unchanged throughout the transport network.

A single network port can carry more than one transport tunnel.

Both MPLS and GRE transport tunnels use a service label.

config>service= epipe enable

config>service~ vpws enable

config>service= no shutdown

config>port= no shutdown

config>service= epipe no shutdown

dot1q

null

qinq

atm

ipcp

bcp-null

Customer ID and SAP ID.

Customer ID and Service ID.

SAP ID and Service ID.

SDP ID and Service ID.

SDP ID and SAP ID.

SDP ID and VC ID.

5000

5004

5008

5014

1514

1528

1536

1540

1560

Route distinguishes are used to ensure that VPRN IP prefixes are globally unique.

Route distinguishes are appended to IPv4 prefixes to form IPv6 prefixes.

Route distinguishes are used to determine which routes a VPRN should import.

CE routes use a route distinguisher to indicate which VPRN they are associated to.

A mirror source listing port 1/1/4.

A mirror destination listing port 1/1/4.

A remote source command indicating the IP address of the service router he is configuring a local mirror on.

Verification that his IP/MPLS infrastructure is in place

None of the above.

F-pipes use SAPs in the form of port: DLCI (e.g. 1/2/3:65).

To the customer, the PE appears as a native Frame Relay UNI (User Network Interface).

Multiple Frame Relay circuits can be mapped to a single F-pipe service on the Alcatel-Lucent 7750 SR.

The MPLS control word is required because the Frame Relay header is not encapsulated in the frame.

BGP

MP-BGP

LDP

MPLS

family ipv4 ipv6

family vpn-ipv4ipv6

family vpn-ipv4 vpn-ipv6

family ipv6 vpn-ipv6

More than one SAP can be configured on a physical port that is configured for null encapsulation.

Dot1Q Ethernet encapsulated access ports can support multiple SAPs and services.

SAPs can be created on ports designated as "Network".

SAPs can only be created on Ethernet ports.

A "remote-source" needs to be added to the mirror destination on PEL

A mirror source needs to be added to PE1 with a "remote-source".

This is not possible since the protocol analyzer is located at the Central Office. It needs to be at the customer site.

A mirror source with SAP 1/1/2 needs to be added on PEL

100Mbps

200Mbps

300Mpbs

600Mbps

700Mbps

Link State PDUs

Link State Updates

Link State Advertisements

Intermediate System Update Packets

Source IP address

TCP source port

Prefix list

Protocol type

There is no such calculation in IS-IS

Show router isis database

Show router isis dijykstra

Show router isis spf

traceroute 2.3.4.1

traceroute 2.3.4.0/24 next-hop 1.2.3.4

traceroute next-hop 1.2.3.4

traceroute does not work on the Alcatel-Lucent 7750 SR

Independent control mode

Ordered control mode

Liberal label retention mode

Conservative label retention mode

Downstream on demand label distribution mode

Assign an admin group to a MPLS interface.

Configure CSPF on the LSP.

Configure at least one strict hop on the LSP path.

Configure an "include" or "exclude" statement on the LSP path.

T-LDP is used to provide an end-to-end session between two PE routers.

T-LDP is used to signal service labels for Layer 2 services.

T-LDP is used to establish transport tunnels for Layer 2 services.

T-LDP is used in LDP over RSVP solution.

The path must include at least one hop.

The path may be used for multiple LSPs.

The path may be used multiple times in a single LSP.

The path must define a tunnel destination IP address.

The number of VPRN routes can become very large. MP-BGP can support a very large number of routes.

MP-BGP can carry routing information for a number of different address families.

MP-BGP is designed to exchange information between routers that are not directly connected. This feature keeps VPRN routing information out of P-routers.

MP-BGP can carry additional information attached to a route as an optional BGP attribute.

All of the above statements are valid reasons for using MP-BGP as a VPRN routing protocol.

Each router requires 1 VPLS service.

Each router requires 2 VPLS services.

Each router requires 1 SDP with 2 LSPs, one to each of the other 2 routers.

Each router requires 2 SDPs.

Each router requires 3 SDPs

vc-type null

vc-type ether

vc-type vlan

vc-type none

A route target is a BGP extended community used to identify the VRF table for a prefix at the receiving PE

A route target is a mechanism from which VPRN controls the distribution of VPN routing information.

Route target attributes are earned in a MP-BGP as attributes of the route.

A route target is used by the PE router to identify the VRF that a VPN-lPv4 prefix is associated with.

All of the above statements describe a route target

None of the above statements describe a route target

Network port

Access port

LSP

SDP

Service

The SDP must be a mesh

The SDP must be a spoke.

Once the SDP is configured on both PE routers, both the services will be operationally up without further configuration changes.

The Layer 2 MTUs must match between the IES and the VPLS

The Layer 2 MTU must be 14 bytes smaller on the VPLS than it is on the IES.

IES does not support QoS.

IES has a configurable IP-MTU

A virtual route table must be configured for an IES service.

An IES interface has an IP address assigned to it.

A group of packets that will be forwarded by the router in the same manner, over the same path.

A group of packets that arrive at the router on the same interface,

A group of packets that leave the router on the same interface.

A group of packets that arrive at the router on the same interface, from the same source.

Disable route summarization on router R3.

Enable LDP aggregate prefix match.

Create an import policy to accept 10.10.10.2/32 and 10.10.10.4/32.

Disable LDP exact match on 10.10.10.2/32 and 10.10.10.4/32.

The router 10.10.10.1 is a PLR providing node protection for the router 10.10.10.3.

One-to-one fast reroute protection is requested by an LSP.

The bypass-link tunnel is used to avoid the link with the egress interface address 10.3.4.4.

The bypass-node tunnel is used to avoid the next-hop downstream router 10.10.10.3.

R1-R2 will have 300Mbps left and R2-R4 will have 400Mbps left.

R1-R2 will have 400Mbps left and R2-R4 will have 400Mbps left.

R1-R2 will have 600Mbps left and R2-R4 will have 600Mbps left.

R1-R2 will have 300Mbps left and R2-R4 will have 600Mbps left.

configure service sdp sdp-id gre create

configure service sdp sdp-id create

Idp

Isp Isp-name

configure service vpls 4 customer 4 vc-id 5 create

configure service vpls 5 customer 4 create

configure service vpls 100 customer 4 vc-id 4 create

configure service vpls vc-id 5 customer4 create

The traceroute will only show one hop: R5-R6.

The traceroute will only show 2 hops; R5-R1 and R4-R6.

The traceroute will only show 3 hops: R5-R1, R1-R4 and R4-R6.

The traceroute will show one hop for each router in the provider core and one for each CE-PE hop.

1

3

6

12

They reduce the number of SDPs that need to be configured.

They can be used to work around physical topologies that prevent a fully meshed deployment.

They prevent loops that can be introduced by mesh deployments.

They can simplify the implementation of security policy enforcement and packet inspection.

The VC ID on the mesh SDP must be explicitly configured.

The VC ID on the spoke SDP must be explicitly configured.

The VC ID on the mesh SDP does not have to be explicitly configured and it will use the service id.

The VC ID on the spoke SDP does not have to be explicitly configured and it will use the service id.

IP filter

MAC filter

Egress label

Ingress label

Dedicates a separate port for each customer.

Performs ARP look-ups for each service.

Maintains a different IP routing table for each service.

Maintains a different MAC Forwarding Database for each service.

Configuring an autonomous system number in the global context.

Configuring a BGP group and peer parameters.

Configuring a VPN-IPv4 address family.

Configuring an export policy to advertise routes between PEs.

TRUE

FALSE

LDP

BGP

MP-BGP

MPLS

The IGP FIB.

The Reservation State Block (RSB)

The Path State Block (PSB)

The opaque database.

Tunnel ID

Name

LSP ID

To

The prefix list "reject" should be "192.168.3.0/16 exact".

Router R1 should be configured as an OSPF "asbr".

The policy was not "committed" after creation.

Router R1 cannot reject the route because OSPF does not support import policies

None

1

2

3

4

The OSPF internal preference

The IS-IS Level 1 internal preference

The IS-IS Level 2 internal preference

The OSPF external preference

The IS-IS Level 2 external preference

The IS-IS Level 1 external preference

Next Header

Traffic Class

Hop Limit

Fragment Offset

Flow Label

A separate label is used for each interface that the FEC is advertised on.

It uses fewer label resources than a per-interface label space.

It is typically used when the device has ATM or Frame Relay interfaces.

It uses more label resources than a per-interface label space.

A single label may be assigned to an FEC and used across all interfaces of the same router.

It is only valid when the LDP peers are directly connected over an interface, and the label is only going to be used for traffic sent over that interface.

Conservative label retention

Liberal label retention.

Downstream on demand.

Downstream unsolicited.

The area addresses TLV

The intermediate system neighbors TLV

The IP interface address TLV

The authentication information TLV

Administrative Groups

Shared Risk Link Groups

Strict hop LSP paths

Fast reroute

Static LSPs

Reserved use

Vendor proprietary use

Management LSPs

Dynamic LSPs

Stub must be configured on Area 1 of router R1, and removed from Area 1 on router R3.

Stub must be configured on Area 1 of router R1 and Area 1 of router R3.

Stub must be configured on Area 0 of router R1 and Area 1 of router R3.

Area 1 of router R3 should be Area 0, in order to connect via stub to router R1.

It supports IGP-based LSPs.

It supports constrained path LSPs.

It does not support loose explicit path LSPs.

It is recommended for use in Traffic Engineering applications.

It cannot be used with facility backup fast reroute.

ping static 10.5.5.5

ping static 0.0.0.0/0

ping 10.5.5.5

ping 0.0.0.0

IPv4 In-Band Management

IPv6 Routing

IPv4 Multicast Routing

IPv6 Multicast Routing

All of the above are MT topologies defined for IS-IS.

Fixed total of 128 bits, where 64 bits are used for routing and 64 bits are used as an interface identifier.

Fixed total of 128 bits, where 32 bits are used for the global prefix, 32 bits are used for the subnet and 64 bits are used as an interface identifier.

Variable total length, where at least 48 bits are used for the global prefix, 48 bits are used for the subnet and 64 bits are used as an interface identifier.

Variable total length, where at least 64 bits are used for routing and 64 bits are used as an interface identifier

RIPv1 and RIPv2

OSPF

IS-IS

BGP

The protocol field of the transport layer header.

The port field of the transport layer header.

The protocol field of the network layer header.

The port field of the network layer address.

The LSP is acknowledged by sending a PSNP PDU.

The LSP is acknowledged by sending an LSP PDU.

The LSP is acknowledged by sending a Hello PDU.

LSP are not acknowledged on broadcast links. The DIS sends periodic CSNPs to maintain database synchronization

When two areas need to communicate and there is no area 0.

When an area needs to traverse another area to reach area 0.

When two areas are connected to area 0, but there is no direct path between them.

When an area needs to connect directly to another area without using area 0.

Link Local LSA

Router LSA

Network LSA

Inter-Area Router LSA

Intra-Area Prefix LSA

None of the above LSAs have an AS scope.

The FCS is verified and kept in the customer frame. The VLAN tag is kept and transported over the network.

The FCS is verified and kept in the customer frame. The VLAN tag is removed for transport over the network.

The FCS is verified and removed from the frame. The VLAN tag is kept and transported over the network.

The FCS is verified and removed from the frame. The VLAN tag is removed for transport over the network.

Mesh SDPs assist MAC learning by flooding traffic to other mesh SDPs.

A PE keeps a single FDB for all VPLSes it has.

Frames received on a SAP that are broadcast, multicast or unknown are flooded.

The FDB only stores the MAC addresses of remote sites.

IP packets sent to an IP multicast address.

Ethernet frames sent to an Ethernet multicast address.

IP packets sent to an IP unicast address.

UDP packets sent to an IP multicast address.

Area ID W B.

Hello and Dead intervals PC.

Stub flag

Checksum values

The list of neighbors

An SDP does not have a path-mtu

The path-mtu must be set by the administrator.

By default, the path-mtu is calculated automatically from the network port MTU of the PE router.

The path-mtu is calculated based on the service MTU of the service using the SDP.

The path-mtu is signaled between the PE endpoints when the service is established.

With a Router LSA originated by router R1.

With a Router LSA originated by router R5.

With a Router LSA originated by router R4.

With an Inter-Area Prefix LSA originated by router R1.

With an Inter-Area Prefix LSA originated by router R5.

With an Inter-Area Prefix LSA originated by router R4.

A POP label stack operation may be performed.

The outgoing interface and next-hop address will be determined from the FIB.

The packet can be forwarded as a labeled or unlabeled packet.

A PUSH label stack operation may be performed.

There are five broadcast links and there are no point-to-point links.

There are five broadcast links and there are five point-to-point links.

There are five broadcast links. It's not possible to say how many point-to-point links there are.

It's not possible to say how many broadcast or point-to-point links there are.

10.32.1.2

10.1.478

1048.1.1

Cannot tell from this configuration

10.1.2.2

Secondary_Path-1

Secondary_Path-2

Secondary_Path-3

Secondary_Path-4

Type 8 LSA — Link Local LSA

Type 9 LSA — Link local Opaque LSA

Type 10 LSA — Area local Opaque LSA

Type 11 LSA —AS Opaque LSA

TRUE

FALSE

10Mbps

20Mbps

30Mpbs

60Mbps

70Mbps

Configure an autonomous system number in the global context.

Configure a BGP group and peer parameters.

Configure a VPN-IPv4 address family.

All of the above steps are mandatory.

None of the above steps are mandatory.

The Isp-ping tool is used to perform a unidirectional LSP test.

The router 10.10.10.2 is the egress router of the LSP.

The router can reach the far-end of the LSP through an RSVP-TE tunnel.

The router can reach the far-end of the LSP through an LDP tunnel.

The router must also have an active static route to the next-hop specified in the static route command.

The system address of the next-hop router must be included in the static route command.

The command option "indirect" must be used in the static-route command.

The system address of the router connected to the destination must be included in the static route command

The service is a local service.

The service requires a second spoke SDP on this router.

The service's VC ID is 44.

The service will accept VLAN tag 100.

When a PE router receives an IPv4 prefix from its local CE it creates a VPN-IPv4 prefix.

The route distinguisher (RD) is appended to the IPv4 prefix to form a 16 byte VPN-IPv4 prefix.

VPN-IPv4 allows BGP to distinguish multiple routes with the same prefixes originated from distinct customers

VPN-IPv4 addresses are only present within the service provider network.

In VPRN, data traffic is carried in VPN-IPv4 packets.

Family ipv4

Family ipv6

Family ipv4 ipv6

Family vpn-ipv4

Family vpn-ipv4 vpn-ipv6

To advertise VPN-IPv4 and VPN-IFV6 routes, two MP-BGP sessions are required.

PE routers must support both IPv4 and IPv6 addresses; customer routers can use either one.

MP-BGP is used to advertise IPv6 prefixes and the associated VPRN labels.

The provider core routers are IPv6-unaware.

OSPF uses TCP, so the protocol number is 6.

OSPF uses UDP, so the protocol number is 17.

OSPF does not use IP.

OSPF has its own protocol number of 89.

From the last 32 bits of the chassis MAC address

From the first 32 bits of the chassis MAC address

The loopback IP address

By using the command "config router ospf rid X.X.X.X"

From the system IP address

From the highest interface IP address

ff00::1:2

fe80::216:4dff:fe13:5cae

::ffff:0:0.240.0.0.1

2001:db8::30a:216:4dff:fe13:5cae

fd01:2234:5678::1

Local FECs not included in the 192.168.1.0/24 address space and the system IP FEC.

Only the system IP FEC appears in the LIB.

Any local FECs, except those with a 24-bit mask.

Local FECs in the 192.168.1.0/24 address space.

All FECs that are in the 192.168.1.0/24 address space.

Local FECs that are in the 192.168.1.0/24 address space.

All FECs that are not in the 192.168.1.0/24 address space.

All FECs except the local FECs that are in the 192.168.1.0/24 address space.

L1 routers

L2 routers

L1/L2 routers

L1 and L2 routers

A Type 4 LSA is originated by an ABR to describe a route to an ASBR to routers outside the area.

A Type 4 LSA is originated by an ASBR to describe a route to itself to routers outside the area.

A Type 4 LSA is originated by an ABR that is connected to a stub area. The LSA is injected into the backbone area to provide routing information.

A Type 4 LSA is originated by an ABR that is connected to a stub area. The LSA is injected into the stub area to provide routing information.

From the least significant 32 bits of the chassis MAC address.

From the most significant 32 bits of the chassis MAC address.

From the loopback IP address.

By using the command "config router router-id X.X.X.X"

From the system IP address.

From the highest interface IP address.

A-pipe

C-pipe

E-pipe

F-pipe

Routers broadcast the entire route table to all neighbors.

Information about directly connected links is sent to all neighbors.

An adjacency database is maintained by each router.

The sequence number for an update is incremented as it is flooded from router to router.

The topological database is the same for all routers in a single area.

It will show the hops taken between service endpoints.

It will test the delay across the service.

It will test the SDPs of a service in both directions.

It will test the round-trip connectivity of the service.

Route redistribution is only needed if Internet access is a requirement.

Route filtering is the process of attaching data path filters to router interfaces.

Route filtering involves deciding whether to permit or deny certain routing updates from being accepted into, or distributed out of, the route-selection process.

Redistribution is needed for exchanging routes from one routing protocol to another.

OSPF routers that are redistributing routes must be configured as ABRs.

Backbone

NSSA

Stub

Totally stubby

Intra-Area Prefix LSA

Inter-Area Prefix LSA

Inter-Area Router LSA

AS External LSA

An L1/L2 router can have adjacencies with routers in different areas.

An L1/L2 router calculates separate SPF trees for the Level 1 and Level 2 topology.

An L1/L2 router advertises its L2 routes to other L1 routers in the same area.

An L1/L2 router sets the ATT bit in L1 LSPs to indicate that it has routes to other areas.

It represents a group of routers on the same non-broadcast network.

It represents the topological database of the backbone network in an IS-IS network.

It represents a broadcast sub-network.

It represents the complete topology of an IS-IS area.