350-501 Practice Test 24 — 15 Questions

Question 1

Which component of SRv6 SID format is used to identify the specific function (e.g., End, End.X) on the node?

Accepted Answer

Function. The SRv6 SID is structured as Locator:Function:Argument. The Function part identifies the specific behavior to be executed on the node, such as End or End.X.

Answer

Argument

Answer

Block

Answer

Locator

Question 2

Which component of an MPLS-TE FRR (Fast Reroute) configuration provides protection for the next-hop node by bypassing it?

Accepted Answer

Node protection. Node protection uses a bypass tunnel that bypasses the protected node, while link protection only bypasses the link.

Answer

Path protection

Answer

Link protection

Answer

Bandwidth protection

Question 3

An MPLS TE tunnel is configured with an explicit path. Which RSVP message is used by the headend to signal the path and carry the Explicit Route Object (ERO) listing the hops?

Accepted Answer

PATH. The PATH message is sent downstream from the headend and contains the ERO that specifies the explicit route.

Answer

RESV

Answer

PATH_TEAR

Answer

RESV_CONFIRM

Question 4

Which SR-MPLS SID is advertised by an IS-IS router to identify a specific link and is distributed only to adjacent neighbors?

Accepted Answer

Adjacency SID. An Adjacency SID is a local label for a specific adjacency, distributed only to neighbors.

Answer

Prefix SID

Answer

Node SID

Answer

Anycast SID

Question 5

In RSVP-TE, which filter spec style allows multiple senders to share the same reserved resources on a link, as long as their flows do not exceed the reservation?

Accepted Answer

Shared Explicit (SE). Shared Explicit (SE) style allows multiple senders to share a single reservation, with explicit sender list.

Answer

Distinct Explicit (DE)

Answer

Fixed Filter (FF)

Answer

Wildcard Filter (WF)

Question 6

An engineer is designing an EVPN IRB (Integrated Routing and Bridging) solution. Which two statements about EVPN IRB are correct? (Choose two.)

Accepted Answer

EVPN IRB uses an anycast default gateway IP and MAC that is shared across all PEs.. EVPN IRB provides bridging at Layer 2 and routing at Layer 3 with an anycast default gateway. It uses asymmetric IRB (bridging locally, routing via VRF) and symmetric IRB (both directions route). The anycast gateway MAC is shared across all PEs.

Answer

EVPN IRB does not support multi-homing.

Answer

EVPN IRB only supports IPv6 traffic.

Answer

EVPN IRB requires a separate VRF for each MAC-VRF.

Question 7

Which THREE functions are provided by EVPN multi-homing? (Choose three.)

Accepted Answer

Aliasing allows other PEs to send traffic to any PE in the multi-homed group.. EVPN multi-homing uses ESI, DF election for BUM traffic, and aliasing for load balancing.

Answer

Split horizon prevents loops by blocking traffic from the same ES.

Answer

MAC mobility is provided by multi-homing.

Question 8

An engineer is implementing MPLS-TE Fast Reroute for link protection. Which protection method provides a backup tunnel that bypasses a specific link, protecting all LSPs traversing that link?

Accepted Answer

Bypass tunnel protecting the link. A bypass tunnel is a single tunnel protecting a link, carrying traffic for all LSPs that traverse that link. Detour tunnels are per-LSP.

Answer

Node protection bypass tunnel

Answer

1:1 detour tunnel per LSP

Answer

FRR using RSVP-TE path pre-emption

Question 9

In EVPN with Integrated Routing and Bridging (IRB), which type of interface is used to connect the bridge domain to the IP-VRF for inter-subnet forwarding?

Accepted Answer

IRB interface. IRB uses an Integrated Routing and Bridging interface (IRB interface) or BVI (Bridge Virtual Interface) to route between VLANs within the EVPN.

Answer

BD interface

Answer

L3VPN interface

Answer

SVI

Question 10

Which THREE are valid SRv6 endpoint behaviors for VPN services? (Choose three.)

Accepted Answer

End.DT2U. End.DT4 for IPv4 L3VPN, End.DT6 for IPv6 L3VPN, and End.DT2U for L2VPN are defined SRv6 behaviors.

Answer

End.B6

Answer

End.X

Question 11

What is the default range of the Segment Routing Global Block (SRGB) on Cisco IOS XR?

Accepted Answer

16000-23999. Default SRGB is 16000-23999, but can be configured. The label range is global across SR domain.

Answer

15000-25000

Answer

16000-24000

Answer

16-23999

Question 12

In MPLS, which forwarding table is used to determine the outgoing label and interface for a labeled packet?

Accepted Answer

LFIB. The LFIB (Label Forwarding Information Base) is the MPLS forwarding table that maps incoming labels to outgoing labels and interfaces.

Answer

FIB

Answer

LIB

Answer

RIB

Question 13

Which TWO statements about MPLS label operations are correct? (Choose two.)

Accepted Answer

At the ingress LSR, a label is pushed onto the packet.. At the ingress, a label is pushed; at the egress, the label is popped. Swap occurs at intermediate routers.

Answer

Label operations are performed based on the IP destination address.

Answer

At the ingress LSR, the label is popped.

Answer

At the egress LSR, a label is swapped.

Question 14

An engineer is configuring SR-MPLS in an IS-IS network. Which IS-IS TLV is used to advertise the Segment Routing Global Block (SRGB) and Node-SID assignments?

Accepted Answer

TLV 242. The IS-IS SR-Capabilities sub-TLV (TLV 242) advertises the SRGB range, while the SR-Algorithm sub-TLV (TLV 242) and Prefix-SID sub-TLV (TLV 135) advertise Node-SIDs.

Answer

TLV 135

Answer

TLV 229

Answer

TLV 22

Question 15

In SRv6 micro-SID (uSID) compression, which part of the SID is used to carry a compressed instruction set, enabling efficient forwarding with a shorter SID list?

Accepted Answer

Function. The micro-SID block consists of a locator followed by compressed function and argument, reducing the SID list size.

Answer

Block

Answer

Locator

Answer

Argument