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

Modify IS-IS sending interval of IIH by port

Modify IS-Cost value of the IS interface

Modify IS-IP address of the IS interface

Modify IS-Level of the IS interface

IGMP Snooping does not consume the CPU of the switch

IGMP Snooping solves the problem of multicast multicast broadcast at Layer 3

IGMP Snooping runs at the link layer and is a multicast constraint mechanism on a Layer 2 Ethernet switch to manage and control multicast groups.

IGMP Snooping establishes a MAC multicast address table by monitoring the IGMP messages sent by the host.

By default, LSFor the same FEC, the received label mapping can only come from the optimal next hop, not from the non-optimal next hop.

When the network topology change causes the next hop neighbor to change, using the free label retention mode, the LSR can directly use the label sent by the original non-optimal next hop neighbor to quickly rebuild the LSP. Liberal requires more memory and tab space.

Label releaseIn the DoD mode, for a specific FEC, the LSR performs label allocation and distribution without obtaining a label request message from the upstream.

The LSP establishment process is actually the process of binding the FEC to the label and advertising the binding to the upstream LSR of the LSP.

When routing is passed, Next_ Hop Attribute must be IPv46 Global Unicast Address

When routing, it will carry AS. _Path and other recognized mandatory attributes

likeUpdate NP is carried in the packet. REACHL NLRI Attribute, indicating that reachable routes are advertised

BGP4+ passUpdate Packets transmit routing information between peers

When sending a neighbor solicitation packet, the source address must be the link-local address of the end interface

When sending a Neighbor Solicitation message, the destination address must be the neighbor's requested node multicast address. C. Two ICMPv6 messages, Neighbor Solicitation and Neighbor Advertisement, are used in the address resolution process.

Address resolution realizes the function of resolving from IPv6 address to link layer address

TRUE

FALSE

The registration packet encapsulates multicast service data.

RPA registration stop message is sent upon receipt of a registration message.

The registration message is used to construct the RPT tree between the source DR and RP.

The registration message is a multicast message.

TRUE

FALSE

The AS number of the adjacent AS, listed in the AS in the BGP routing entry_ The far right of the Path list.

BGP Speaker When the route learned from the EBCP peer is advertised to the IBGP peer, the next hop attribute of the route information is not changed.

Local Prefs are only valid between EBGP peers and are not advertised to third-party ASs.

A route can only have one community attribute value.

routerThere is no external route to 100.1.1.0/24 in R1's IP routing table

routerIn R1's IP routing table, there is an external route to 100.1.1.0/24

routerIn the IP routing table of R1, there is no loopback route to R2

routerIn the IP routing table of R1, there is no loopback route to R3

By default, the device supports PHP feature, the Egress node that supports PHP assigns the label value of 3 to the penultimate hop node.

When the value of the label is 0, it means that the label must be popped, and the forwarding of the packet must be based on IPv4.4

MPLSThe tag is 4 bytes long and is encapsulated between the link layer and the network layer.

If the stack bottom label in the label is S=0, it indicates that the label is the stack bottom label, and the IP is directly performed.Forward.

StubNet

P-2-P

Vlink

TransNet

RSTP adds types of port states

RSTP has less overhead

RSTP does not converge based on timers

RSTP has smaller timers

filter-policy can be used on R2 expoThe rt command filters the loopback route of R3

R2 can be used in Area use filter in 0r import command to filter the loopback route of R3

filter-policy can be used on R1 import filters the loopback route of R3

Area is available on R2 Use filter in 1r expot command to filterR3 loopback route

Route entries for 10.0.2.2/32 and 10.0.0.0/16 exist in R1's IP routing table

There are both 10.0.3.3/32 and 10.0.0.0/16-bit routing entries in the IP routing table of R1

becauseR2 has performed route aggregation, and only the route entry of 10.0.0.0/16 exists in the IP routing table of R1

Route entries for 10.0.2.2/32 and 10.0.3.3/32 exist in R1's IP routing table

Enable local preferential forwarding of traffic

Connect stacking devices via stacking cards

Configuring the MAC Address Switching of the Stacking System

Enabling the Stacked Multi-Master Checking Function

The VPN instance parameters on PE1 or PE2 are incorrectly configured

PE1 or PE2 is not enabled in BGP-VPNv4 unicast address family view neighbor

the LSP tunnel between PE1 and PE2 is not established

The routing protocol between PE1 or PE2 and the respective CE is incorrectly configured

The switch will drop the frame

The switch will record the source MAC address of the data frame and flood the data frame

The switch will forward the data out an interface according to the destination MAC address of the data frame

The switch will buffer the data frame and forward it after waiting for the destination host to send the data frame

AS-External-LSA does not belong to any area

The cost value of the second type of external route is only the AS external cost value, ignoring the AS internal cost value

AS-External-LSA describes the path to the AS external route, and the flooding range is AS external

AS-External-LSA Describes the path from the router to the ASBR

EBGP Multi-hop is not configured

Firewall did not let go of IP protocol number 89

Firewall did not let go of UDP port number 179

BGP neighbors must form layer 2 adjacencies

TRUE

FALSE

Can only be issued by force

Can be issued on ASBR

Can be issued uncompulsorily

Can be sent on ABR

True

false

True .

false

Both types of packets need to be confirmed by the peer router after they are sent, otherwise they will need to be retransmitted.

Once the adjacency is established successfully, CSNP packets and DD packets will stop sending

Both types of packets do not need to be confirmed by the peer router after they are sent.

OSPThe master-slave relationship in the DD packet interaction of F has no identity binding with DR/BDR; while CSNP packets are only generated by DIS

host IP address

Host MAC address

Layer 3 VNI

Layer 2 VNI

TRUE

FALSE

use import-route BGP commands can import IBGP routes

AS-path-filter is the needle to AS-path, thus affecting the route selection.

OSPF, ISIS, and BGP can all deliver default routes.

in node 10, if-match community-filter 1 and if-match as-path-filter 1 is"with" relationship

In the case of CE multi-homing, enabling the BGP AS number replacement function may cause routing loops. BGP So can be used to prevent routing loops in VPN sites.

When BGP is used to exchange routing information between PE and CE, if the autonomous systems where the two VPN sites are located use the same private AS number, the AS number replacement function can be used to replace the received AS number with any specified AS number. The As number in the private network route, to prevent the route from being discarded due to repeated AS numbers

When BGP is used to exchange routing information between PE and CE, there is no need to import private network routes into BGP on PE.

In the Hub & Spoke scenario, when Hub-CE and Hub-PE use IGP, Spoke-PE and Spoke-CE cannot use EBGP

True

false

MP of update packets_ UNREACH_NLRI, Does not contain a path attribute.

MP- BGP can be used to assign labels.

MP_REACH_NLRI and MP_UNREACIH_NLRI are both optional transition properties.

a full MP_The REACH_NLRI attribute structure contains address family, next hop and prefix information.

[Huawei]interface GigabitEthernet 0/0/1 [Huawei-GigabitEthernet0/0/1]port link type trunk

[Huawei-GigabitEthernet0/0/1port trunk allow pass vlan 10

[Huaweijinterface GigabitEthernet 0/0/1

[Huawei-GigabitEthernet0/0/1]port link type access [Huawei GigabitEthernet0/0/1]ipsg enable

. [Huawei]interface GigabitEthernet 0/0/1

[Huawei-GigabitEthernet0/0l]port link-type access [Huawei-GigabitEthernet0/0/1 ]port-security enable

[Huawei]interface GigabitEthernet 0/0/1

[Huawei-GigabitEthernet0/0/1 ]port link type access [Huawei-GigabitEthernet0/0/1]port isolate enable

The next-hop router of router HW has no path to reach the destination address

Ping was successful, but congestion occurred on the path to the destination

ICMP packets can reach the destination address, but the destination device fails to reply

router HWThere is no valid route to the destination address

There is a firewall in the remote destination network, and I have not been releasedCMP traffic

Aggregator

Local-Pref

Multi Exit-Disc

Community

TRUE

FALSE

The label forwarding path LSP is determined and established through various protocols during packet forwarding.

The label is definitely not peeled off on the LSR.

Both LER and LSR do label distribution.

The device will discard the IP packets entering the MPLS domain.

TRUE

FALSE

LSA3

LSA1

LSA5

LSA2

R2 router's LSDB does not have R4's LSP

R2 router's LSDB does not have R3's LSP

R1 router's LSDB does not exist R4's LSP

R3 router's LSDB does not exist R4's LSP

BFDThe one-arm echo function must configure the local identifier and the terminal identifier

BPThe default destination IP address of the protocol packet of the D one-arm echo is 224.0.0.184

BAfter the FD one-arm echo function is enabled, the destination IP and source IP of BFD packets are the same

BFDThe one-arm echo function is suitable for scenarios where one device supports BD and the other device does not.

existR2 OSPF Process and IS-IS During the process, the default route is advertised separately

only at In the OSPF process of R2, the default route is advertised

No configuration required

only in R2 During the IS-IS process, the default route is advertised

source address

destination port number

source port number

destination address

Host ARP Advertisement

BUM packet forwarding

hostMAC address advertisement

Host IP route advertisement

AS External LSA

Router LSA

Network LSA

Summary LSA

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

Outgoing interface

MAC address

IP address

VLAN ID

The routing entry in the peer BGP routing table is not optimal.

The next hop address of the BGP route entry is unreachable?

The peer is configured with peer ignore

The peer is configured with active-route-advertise

Level of ISIS-1 for SNPs and LSPs.

Level of ISIS-2 SNPs and LSPs.

ISIS Level-1 ofHello message.

ISIS Level-2Hello message.

iBGP-Multi-hop not configured

Authentication failed

IGP routing failure

Inconsistent BGP protocol versions

The CSNP packet sending interval of Leve1-2 of this interface is 5s

The hello packet sending interval of the interface Leve-1 and Leve1-2 is 5s

The hello packet sending interval of the interface Leve1-1 is 5s

The hello packet sending interval of the interface Leve1-2 is 5s

Each router establishes a topology of the entire flooding domain

Each router learns routing entries directly from routing updates and adds them to the routing table

Routers in a flood domain may receive the same link state information repeatedly

Routers throughout the flood domain have the same link-state database

The router will send all link state information from one neighbor to all other neighbors to ensure the synchronization of the database

R3 must be the DIS of a level-1 link

The R3 router is a level-1-2 router

R3 must be the DIS of a level-2 link

R3 router system ID is 0003.0000.0000

2013:0:130F:0:0:09C0:876A:130B

2013::130F::9C0:876A:130B

2013:0:130F:0:0:9C0:876A: 130B

213::130F::9C:876A:13B

2013:0:130F::9C0:876A:130B

802.3z

802.3ab

802.3ad

802.3af

239.0.0.0-239.255 255 255

241.0.0.0-241.255.255.255

twenty two4 .0.0.0-224 255 255 255

240.0.0.0-254 .255 255.255

226.0.0.0-226 .255 255.255

Advertising Router is set as the router of ASBR ID

NetMask is set to all 0s

Link State ID is set to the destination network segment address

Use Link State ID and Advertising A router can uniquely identify an LSA

NAT64

IPv46 over IPv44

Dual Stack

ISATAP

Occupies memory for cached frames

Increase the power consumption of the power supply

OccupyTCAM entry

consume available bandwidth

Consume MAC address entries available in the system

TRUE

FALSE

If the BGP protocol is running, use the community attribute to mark the route

Use ACLs to mark routes on routers.

Use tagsThe value marks the route on the router.

use ip-prefix in The route is marked on the router.

True

false

Network-LSA

Router-LSA

Link-LSA

Inter-Area-Prefix-LSA

IP-prefix

AS-path-filter

Regular-expression

ACL

Type5

Type4

Type1

Type2

Type3

digital envelope

Issuer

digital signature

public key information