H12-261_V3.0 HCIE-Routing & Switching (Written) V3.0 Questions and Answers

True

false

TRUE

FALSE

On an interface, RSTP does not age out BPDUs

after more than 6 seconds.

existAfter MaxAge times out

existHello after time out

existForward After Delay times out

Type5 LSA

Type7 LSA

Type3 LSA

Type1 LSA

SNMPV1

SNMPV2C

SNMPV3

All versions can be implemented

If load balancing is configured, the traffic will be evenly distributed to each link

When the number of equal-cost routes in the network is greater than the number configured by the command, and the priority of these routes is the same, the route with the larger System ID of the next hop device is preferred for load balancing

For each route in the equal-cost route, a priority can be specified, the route with higher priority will be preferred, and the rest will be used as backup routes

After the equal-cost route priority is configured, when the IS-IS device forwards the traffic reaching the destination network segment, it will not adopt the load balancing method, but forward the traffic to the next hop with the highest priority

If not configuredRD-filter. However, if this RD-filter is used for filtering, the matching result is deny.

If configuredRD-filter, but the RD of the route does not match any of the RDs defined in the rule, the default matching result is permit.

Multiple rules are matched according to the configuration order.

RD-filter Between configured rules is always "or"Relationship.

Compared with RSTP, MSTP has more port roles.

The BPDU format of MSTP is the same as that of RSTP.

MSTP can realize load sharing of traffic between different VLANs

MSTP supports compatible operation with RSTP

Duplicate address detection

Neighbor status tracking

Path MTU discovery

Address resolution

TRUE

FALSE

matches the address of the group the user joinedGroup-wide mask length for C-RP services

C-RP priority

IP address of the C-RP interface

Number of the C-RP interface

802.1D bridges only forward BPs received from the root bridgeDU message

802.1D bridge will not forward BPDU message

802.1The w bridge only forwards BPDUs received from the root bridge

802.1w Bridges do not forward BPDUs

interface GigabitEthernet0/0/1 undo eth-trunk 1

interface GigabitEthernet0/0/1 undo shutdownwn

Member interfaces can be added to a link aggregation group enabled by the following command: interface GigabitEthermet0/0/1 shutdownwn

interface GigabitEthernet0/0/1 trunkport GigabitEthernet0/0/1 interface GigabitEthermet0/0/1 undo shutdownwn

When using IPsec master and backup link redundancy backup, enable it on the physical interfaceURPF function, it is recommended to use URPF loose mode.

When using IPsec multi-link redundancy backup, it is possible toURPF function, you can use URPF strict mode

When using IPsec multi-link redundancy backup, enable it on the tunnel interfaceURPF function, you can use URPF strict mode.

When using IPsec master and backup link redundancy backup, enable it on the physical interfaceURPF function, you can use URPF strict mode.

Interface authentication can be used to authenticate Level-1 and Level-2 hello packets

After interface authentication is configured, the IIH sent by the router must carry the authentication TL.V

After configuring the area authentication, the IIH, S sent by the routerNP, LSP must be connected with certified TLV

If the two routers are configured for area authentication and interface authentication respectively, and the passwords are the same, the two routers can establish a neighbor relationship.

ASBR cannot be stored in stub area.

Virtual connections cannot pass through stubsarea.

Type injection is not allowed in stub area7 LSA

The backbone area cannot be configured as a stubarea.

R5 can learn the loopback route of R2 normally

R3 cannot learn the loopback route of R2

R1 can normally learn the loopback route of R2

R3 can learn the loopback route of R2 normally

TRUE

FALSE

if the Ethernet0/0/0 interface of R1 is down, then R2 will become the master device

if the Ethernet0/0/1 interface of R1 is down, then R2 will become the master device

if the GE0/0/0 interface of R3 is down, then R2 will become the master device

if the Ethernet0/0/0 interface of R3 is down, then R2 will become the master device

TRUE

False

session layer

data link layer

transport layer

presentation layer

physical layer

application layer

Shutdown

Remark

Restrict

Protect

When configuring priorities, make sure that the same router is the master in the RRP backup group

Multiple VRRP backup groups can be created on an interface of a router. The router can be used as both the master of a VRRP backup group and the backup of other VRRP backup groups

When deploying load balancing, the hosts on the same local area network are required to be configured with the IP addresses of different virtual routers as the default gateway addresses.

VRRPLoad balancing requires at least two virtual routers to provide forwarding services at the same time

True

false

In the case of no route reflector, the IBGP neighbor relationship needs to be fully interconnected. The introduction of route reflectors can reduce the requirements for full interconnection

A route reflector can-The route learned by the client is advertised to all clients

A route reflector can advertise routes learned from a client to other clients and non--client

Route reflectors can advertise routes learned from IBGP neighbors to all clients and non-client

TRUE

FALSE

If the source IP address of the packet is 10.0.1.2, it can be forwarded, and at the same timeDSCP field is marked as CS3

If the packet source IP address is 10.0.1.1, it can be forwarded, and the DSCP field is marked as CS3

If the source IP address of the packet is 10.0.1.2, it cannot be forwarded

If the source IP address of the packet is 10.0.1.2, it can be forwarded, and at the same timeDSCP field remains unchanged

True

false

display alarm

display current- configuration

display interface brief

display clock

Reachable

Incomplete

Stale

Probe

Use traffic shaping in the ingress direction and traffic policing in the egress direction

For traffic shaping, routers buffer excess packets until bandwidth is available again

Traffic policing uses the token bucket algorithm, and traffic shaping uses the SPD algorithm

For traffic policing, it can be more thanCIR Traffic Adjustment Buffer Usage

For traffic shaping, can be more thanCIR Traffic Adjustment Buffer Usage

TRUE

FALSE

Regular expression

IP-prefix

AS-path-filter

Community-filt

Added maximum response time field

Added out-of-group packets

Added specific group query message

Added specific source group query packets

True

false

R2 can learn two routes, 10.1.2.0/24 and 10.1.3.0/24.

R2 can learn the route 10.1.1.0/24.

R2 can receive the LSP of R1, but cannot add it to the routing table.

R2 can learn all routes of R1.

True

false

TRUE

FALSE

OSPF version number changed from 2 to 3

There is no change in the option field of the He11o packet

Hello packets no longer contain address information and carry Interface ID

Removed Authentication, Auth Type field

DSCP set to decimal 36

IP ToS is set to 0xEF

IP Experimental EEN

DSCP set to decimal 5

bitstream 101110

Both VRRPv2 and VRRPv3 support authentication

VRRPv3 does not support the authentication function, while VRRPv2 supports the authentication function.

VRRPv2 is only applicable to IPv4 networks, and VRRPv3 is only applicable to IPv6 networks.

Masterr The owner of the IP address VThe RP priority is 255, so the configurable priority range is 0-254

30

80

50

40

IGMPv2

BGP

OSPF

PIMv2

True

false

MaxAge

root cost

Forward delay

Hold time

Hello time

Discard the route directly.

It is no longer advertised to other BGP routers.

Advertise to IBGP onlyneighbour.

The route is advertised normally, but the route is not used to forward data.

Head Office: Import Target: 1:1; Export Target: 3:3. Branch 1: Import Target:3:3: Export Target:1:1. Branch 2 Import Target: 3: 3; Export Target: 2: 2

Head Office: Import Target: 2:2; Export Target: 3:3. Branch 1: Import Target:3:3; Export Target:1:1. Branch 2: Import Target: 3: 3; Export Target: 2: 2

Head Office: Import Target: 12:3; Export Target: 3:12. Branch 1: Import Target: 3:12; Export Target: 12:3. Branch 2: Import Target: 3: 12; Export Target: 12: 3

Head Office: Import Target:1:1,2:2; Export Target:3:3. Branch 1: Import Target:3:3;

Export Target: 1:1. Branch 2: Import Target: 3: 3; Export Target: 2: 2

StubNet

P-2-P

Vlink

TransNet

packetTTL and source IP address

source IPaddress and Layer 2 source address

Source IP address and specific protocol(such as FTP, HTTP Wait)

Type of Service header and message length

R1

R2

R3

R4

A carried by routeSPATH attribute to filter routes received from BGP neighbors. For example the command peer xxxx as-path-fliter import

Route apply clause in policy

A carried by routeSPATH attribute to filter routes sent to BGP neighbors. For example the command peer xxxx as-path-ilter export

if-match clause in Route-policy

TRUE

FALSE

True

false

TRUE

FALSE

Policy routing mainly controls the forwarding of packets, that is, it can forward packets without following the routing table. B. Policy routing mainly controls the import, publication, and reception of routing information.

The routing policy mainly controls the import, publication and reception of routing information

The routing policy is mainly to control the forwarding of packets, that is, it is not necessary to forward packets according to the routing table

Provides a built-in policer to limit the maximum available bandwidth for low-latency queues during times of congestion

This parameter should be as small as possible. It means that the bandwidth is always reserved, even if LLQ is used, this parameter will reduce the available bandwidth of the interface

It means reference CIR to calculate burst size of built-in policer token bucket

This parameter is optional because LLQ always takes precedence over other queues

The transmission node device will replace the existing stack top label (outermost label) with the label allocated by the next hop device.

When IP Packet enters MPLS domain, check the destination IP Tunne corresponding to the addressl ID Is the value 0x0 if Tunnel ID value is 0x0, then enter MPLS forwarding process.

when IP Packet enters MPLS domain, MPLS The boundary device is in the packet layer 2 header and IP Insert a new label between the headers

sign.

By default, PHP is supported Egress The label value assigned by the node to the penultimate hop node is 3.

cir 10000 pir 12000

cir 10000 cbs 12000 pbd 12000

cir 8000 pir 12000

cir 10000 cbs 10000 pbs 12000

in Pipe mode. When an IP packet passes through an MPLS network, at the ingress node, IP TTL minus 1 maps to MPLS TTL field.

in the MPLS labelTTL, which has the same meaning as the TL field in the IP header. TTL can prevent routing loops in MPLS networks.

In Unifor mode, when IP packets pass through the MPLS network, the TTL minus 1. MPLS The TTL field is a fixed value.

in MPLS In VPI, if you want to hide the structure of the MPLS backbone network, you can use the IngUni on ress form mode.

The prefix is learned through other IBGP neighbors, or the prefix is learned from EBGP neighbors, or the prefix is learned through route importarrived

Prefixes that exist in the routing table

The prefix is learned through other BGP neighbors, or the prefix is locally through network or route introduction learned

The prefix is learned via EBGP neighbors, or the prefix is locally via network or route introduction learned

The prefix is learned from EBGP neighbors, or the prefix is learned from RR

device the state between R3 is "2-way". So what can you conclude from this output?

Router R2 is not a DR

Router R3 is not a DR, nor a BDR

router there is no full adjacency between R2 and router R3

routerR4 is DR

Router R2 is DR or BDR

True

false

True

false

R2 is in the area 0 generated inType3 LSAcontains 10.0.2.2/32routing information

R2 is in the area 0 generated inType2 LSAcontains 10.O.2.2/24routing information

R2 is in the area 0 generated inType1 LSAcontains 10.0.2.2/32routing information

R2 is in the area 0 generated inType5 LSAcontains 10.0.2.2/32routing information

MPLS system has many kinds of label publishing protocols, such as LDP is a kind of label publishing protocol

MPLS supports single-layer labels and multi-layer labels

the label is a fixed-length identifier with only local significance, used to uniquely identify the FEC to which a packet belongs

the label is carried by the header of the MPLS packet, and has global significance, that is, the label value of all routers cannot be repeated

TRUE

FALSE

VPLS is a technology widely used in the existing network, which can provide transparent transmission of Layer 3 packets and realize multi-point access.

The VPLS configuration is complex, and the Layer 2 network transparently transmits BUM packets.

BGP EVPN supports tenant isolation, Multi-homing and broadcast suppression and other functions.

BGP EVPN solves the problems of MAC address flapping and multi-tenancy that VPLS cannot support.

Use the loopback interface to establish an EBGP neighbor relationship and configure EBGP Multi-hop, configure the loopback interface as the update source, and then use IGP to achieve equal-cost path load sharing between loopback addresses)

To configure the EBGP neighbor relationship with the loopback interface as the update source, the IGP in each AS needs to introduce two equal-cost paths to the EBGP neighbor loopback interface address; and you need to use the command "next-hop-local"

Use the command "ebgp-load on both ends"-balance"

To configure the EBGP neighbor relationship with the loopback interface as the update source, the IGP in each AS needs to introduce two equal-cost paths to the EBGP neighbor loopback interface address; and you need to use the command"ebgp-maxhop" and "next-hop-local"