2020 HCIE-Carrier IP (Written) H31-161 Training Material

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2020 HCIE-Carrier IP (Written) H31-161 Training Material

1. Which statements about the edge access layer is true?

Using the packet technology it provides a comprehensive transport platform that boasts high reliability, quality of service (QoS) assurance, and large capacity.

It implement call control. With the software technology as the core, it completes basic real-time call control and connection control.

It connections users to the network by providing various access means, and converts the format of information can be transmitted on the network.

It process additional value-added service and operation support for established callas.

2. Which statement describes the delay variation requirement of the voice service for the IP bearer network?

No strict requirement

Bearer network delay variation + 1s

Bearer network delay variation +100 ms, allowed maximum delay variation +200ms

Bearer network delay variation = 10 ms. Allowed maximum delay variation =20ms

3. Which statement describes the packet loss ratio requirement of the voice service for the IP bearer network?

Allowed maximum packet loss =10-6

Allowed maximum packet loss =1%

No strict requirement

Allowed maximum packet loss =1%

4. Which of the following can be implemented in an IP backbone network?

RIP

BGP

ISIS

MPLS

5. RTA is a provider edge (PE) router. OSPF is deployed between RTA and a customer edge (CE).

Which of the following can be used to avoid routing loops when RTA generate an autonomy system-external (ASE) link-state advertisement (LSA) and sends it to the CE?

Configuring the same VPN route tag on the PE

Configuring Shame Link among PEs

Setting DN-bit in the ASE LSA

Configuring the same domain ID on the PE

6. Exhibit:

As shown in the figure, external route 1.1.1.0/24 is imported to RTA that is located in the NSSA area RTD is a backbone area router. RTB and RTC are both area border router (ABRs).

OSPF configuration are as follows.

Which statement is true?

RTD receive two external LSAs whose LS_ID is 1.1.1.0

RTD receive an external LSAs whose LS_ID is 1.1.1.0 and advRouter is 2.2.2.2.

RTD receive an external LSAs whose LS_ID is 1.1.1.0 and advRouter is 3.3.3.3.

RTD receive an external LSAs whose LS_ID is 1.1.10/24 based on category 7 LSAs sent by RTA

7. 1-On the backbone network, if a PE is connect to a CE, VPN instances need to b reconfigured on the PE, and interface on the PE for connecting to the CE must be bound to a VPN instance. After binding an interface to a VPN instance, you must configure the IP address of the interface between PEs, IS-IS configured for PE interworking. PLSA basic capabilities and MPLS LSP are configured for LSP establishment, and MP _IBGP is configured for VPN route exchange VPN routes exchange , LDAP is short for Label Distribution Protocol, and IBGP is short for interior Border gateway protocol.

2-A CE exchange route exchange routers with a PE over External Border gateway Protocol (EBGP. Configure interior gateway protocol (IGP) on the IS-IS+MPLS backbone networking to achieve the interworking between PEs and IP routers.

-4

-3

-2

-5

-1

8. As shown in the figure. CE 1 and CE 3 belong to VPN-A, and CE 2 CE 2 4 belong to VPN-B VPN-target VPN-A is 111:1 and that of VPN-B is 222:2 users on different VPNs are not allowed to access each other.

Configuration principles are as follows:

On the backbone network VPNs are not connected to a CE, VPN instance need to be configured on the PE, and an interface on the PE for connecting to the CE must be bounded to a VPN instance. After binding an interface to a VPN instance, you must configure the IP address of the interface Between

PEs, IS-IS is configured for PE interworking. MPLS basic capabilities and MPLS LDP are configured for MPLS LSP establishment, and MP-IBGP is configured for VPN route exchange.

How to enable CE 1 to learn routes from AS 64430?

Import IS-IS 200 routes in IS-IS process 100

Import IS-IS 100 routes in IS-IS process 100

Import BGP routes in IS-IS process 100

Import BGP routes in IS-IS process 200

9. Exhibit:

As shown in the figure, RTA belongs to AS 100 and has an EBGP neighbor relationship with RTC, RTD, and TTB is an IBGP neighbor of RTC, RTD, and RTE, and the four router all belong to AS 200. (Note: The attributed not involved In the question use the default values)

Import route 1.1.1/32 from RTA and advertise this route to RTB by way of RTC, RTD, and RTE, respectively (suppose the three routers between is IGP, EGP, and INCOMPL: ETE, respectively.

Which route will RTB prefer?

Suppose the preceding policy is retained. Apply inbound routing policies on RTC, RTD, and RTE so that the values of the MED attribute of route 1.1.1.32 learned by RTB are 40, and 20 respectively.

Which route will RTB prefer?

Suppose the preceding policy is retained. Apply an inbound routing policy on RTB so that the values of the AS_ PATH attribute of route 1.1.1.1/32

Learned from RTC, RTD, and RTE are 10 20 30,and 10 20, respectively.

Which route will RTB prefer?

Suppose the preceding policy is retained. Apply an inbound routing policy on RTB so that the values of the local-preference attribute of route 1.1.1.1.32 learned from RTC and RTE are 30 and 120 , respectively.Whichroute will RTB prefer?
Suppose the preceding policy is retained. Apply inbound policies on RTC. RTD and RTE so that the values of the preferred-value attribute of route 1.1.1.132 are 50.40 and 30 respectively.

Which route will RTB prefer?

RTC, RTC, RTE, RTC, RTE

RTC, RTD, RTD, RTE. RTE

RTC, RTC, RTD, RTC, RTE

RTC, RTC, RTD, RTE, RTE

10. Exhibit:

As shown in the figure, RTA and have one BGP session. To detect fault fast, the BFD for BGP feature needs to be configured on RTA and RTB.

BGP-related configurations are as follows:

The only Ethernet link between RTA and RTB becomes faulty when the BGP neighbor session is in ESTABLISHED state and the BFD session is in the UP state.

Which statements is true? (Note: BFD works in asynchronous mode)

RTA detect the fault faster than RTB.

The BGP session between RTA and RTB is interrupted when the BGP hold time (time duration is 180s by default) express.

RTB detect the fault faster than RTA.

RTA and RTB detect the fault simultaneously.

11. Exhibit:

As shown in the figure, virtual private LAN service (VPLS) is enabled on routers PE 1 and PE 2. CEs are connected to PEs through QinQ and PC A and PC B are connected to the two CEs. The two PCs belong to the same VPN and can communicate with each other properly.

Which of the following statements about the communication process when you ping PC B from PC A are true?

PE 1 receives packets with a VLAN tag from CE 1 and adds a VLAN tag to these packets.

If the penultimate hop popping (PHP) feature of MPLS is enabled on PEs, a packet received by PE 2 from a P router has two VLAN tags one MPLS label.

PE 1 add two MPLS labels to a packet before sending the packet to a router.

A packet received by CE 2 from PE 2 has two VLAN tags CE 2 removed the outer tab and forwards the packets to PC B based on the inner tag

12. Exhibit:

As shown in the figure, Super VLAN is enabled on SWA (a LAN switch).

The Super VLAN configuration is as follows:

Which of the following specifics the time order in which the preceding debugging information is generated?

3–4–1–2

1–2–3–4

1–4–2–3

3–2–1–4

13. Configure VRFs and relevant policies on a PE as follows:

If a route is imported to the routing table of VRF 1, which VRF can the route match?

vrf4

vrf3

vrf2

14. Which statement about the configuration of route target (RT) and route distinguisher (RD) is true?

If routes need to exchange between two VPNs, the value of import RT of one VPN must be partially the same as Export RT of the other VPN.

RD and RT of a VPN instance cannot be the same as those of another VPN instance on the same
PE.

If routers need to exchanged two VPNs, the value of import RT of one of the same as that of RT of the other VPN.

Two instances of a VPN share an RT.

15. Which statement about the Hub s MPLS VPN networking is false?

The Hub PE can receive the VPN_IPv4 routes advertised by all Spoke PEs.

When an MP-IBGB neighbor relationship is established between two spoke PEs, the value of the Import VPN Target attribute of one Spoke PE can be the same as tat of the Export VPN Target attribute of the other Spoke PE.

The Hub PE advertises the routes learned from one Spoke PE to other Spoke PEs. Therefore, Spoke sites can access other through the Hub site.

All Spoke PEs can receive the VPN-IPv4 routes advertised by the Hub PE.

16. Exhibit:

Which statement about inter-AS MPLS VPN Option_B is false?

The ASBR cannot be used as a PE simultaneously and a CE cannot be connected to an ASBR.

When ASBRs are directly connected, packets transmitted on the VPN between them have only one label.

The undo policy vpn-target command must be configured in the VPN4 address family view of the BGP neighbor of the ASBR to prevent routes from being filtered automatically.

When ASBRs are directly connected, VPN traffic can be forwarder between them only after MPLS is enabled on the interfaces.

17. Exhibit:

As shown in the figure, inter-AS VPN Option A is used. CE 1 and CE 2 belong to the same VPNAS 100 and AS 200 run IGP and LDP, respectively.

ASBRs communicate with each other through EBGP. the loopback interface address of CE 1 is 10.1.1.1/24 Suppose VPNs configured on the PE and ASBR are both named vpn-1 and CE 2 can ping CE1.

Which command can be ruin on ASBR 2 to find out route 10.1.1.1/24?

Display ip routing-table vpn-instance vpn_1

Display ip routing-table

Display bgp vpnv4 all routing-table

18. Which of the following statements about the merits of the HoVPN networking are true?

If the UPE are SPE are separated by an IP/IPMLS network, they can be connected through a generic routing encapsulation (GRE) or LSP runnel. A hierarchical MPLS VPN provides good scalability.

The SPE and UP exchange routes and advertise labels through MP-BGP. Each UPE runs only one – BGP peer, reducing system overheads and simplifying configuration.

The BGP/MPLS VPN can be deployed layers by layer. When the performance of a super strum provider edge (SPE) is insufficient, a user-end provider edge (UPE) can be added and the SPE moved to a lower layer. When the access capability of a UPE is insufficient, and SPE can be added.

Packets are forwarded between a UPE and an SPE after being label. The UPE and SPE are connected through an interface (or a subinterface), helping reduce the usage of limited interface resources.

Only local VPN routes need to be maintained on an SPE and remote routes on the SPE are represented by a default route or an aggregate route, reducing the load of the SPE.

19. Exhibit:

As shown in the figure, OSPF process 100 runs on both PEs and CEs, and VPN routers are transmitted between PE 1 and PE 2 through PGB CE 1 enables interface address 43.1.1.0/24 in area 0.A route to 43.1.10/24.

However, does not exist in the routing table of CE 2.

What are the possible causes?

The VPN route to 43.1.1.0/24 does not exist in the routing table of PE 2.

The LSDB of PE 1 does not have the type 1 LSA generated by CE 1.

The LSDB of PE 12 does not have the type 1 LSA generated by CE 1.

The public network rout to 43.1.1.0/24 does not exist in the routing table of PE2

20. Which statement about primary VPN tunnel binding is false?

Only the data destined for the specific peer device is transmitted through the n=bound primary VPN tunnel Data to other devices is transmitted using the default tunnel policy.

Primary tunnel ensures that data can be transmitted from a VPN t a specific peer device permanently through a dedicate TE tunnel.

Primary VPN tunnel binding means to bind a tunnel to a specific VPN. The bound tunnel is exclusive to the VPN.

The bound primary tunnel can be selected sequentially.

2020 HCIE-Carrier IP (Written) H31-161 Training Material

2020 HCIE-Carrier IP (Written) H31-161 Training Material

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