Question 1

In traffic policing using two token buckets & two-rate, when the CIR is set to 1 Mbit/s and the PIR is set to 2 Mbit/s, what is the maximum transmission rate for the traffic in green?

Accepted Answer

The maximum transmission rate for traffic in green is limited by the Committed Information Rate (CIR), which is 1 Mbit/s.

Question 2

During the GR of dynamic routing protocols (such as OSPF and BGP) neighbor relationships remain unchanged.

Accepted Answer

The answer of During the GR of dynamic routing protocols...

Question 3

Simple traffic classification can be performed based on which of the following information in VLAN packets?

Accepted Answer

802.1p is a standard for prioritizing network traffic at the data link layer, which is used in VLAN tagging to classify and manage traffic.

Question 4

Which of the following congestion avoidance mechanisms can be used to avoid global TCP synchronization? (Choose two.)

Accepted Answer

RED and WRED are both congestion avoidance mechanisms that can be used to avoid global TCP synchronization. RED (Random Early Detection) and WRED (Weighted Random Early Detection) are both active queue management (AQM) algorithms that drop packets before the queue is full, in order to prevent congestion. This helps to avoid the "synchronized" behavior of TCP, where all TCP connections slow down at the same time.

Question 5

BFD is a common fast detection technology. It implements the fast switchover function only when collaborating with other fast switchover technologies.

Accepted Answer

BFD (Bidirectional Forwarding Detection) is a protocol used for rapid detection of faults in the path between two forwarding engines. It requires collaboration with other technologies to implement fast switchover functions.

Question 6

A VRRP virtual router can have one or more IP addresses.

Accepted Answer

A VRRP (Virtual Router Redundancy Protocol) virtual router can be configured with multiple IP addresses to provide redundancy and load balancing.

Question 7

Traffic shaping usually buffers packets that need to be dropped by traffic policing by means of buffer and token bucket.

Accepted Answer

Traffic shaping uses buffers and token buckets to temporarily store packets that would otherwise be dropped by traffic policing. This allows the network to smooth out traffic flow and prevent congestion.

Question 8

The interface IP address and virtual IP address configured for VRRP must not be identical.

Accepted Answer

The interface IP address and virtual IP address configured for VRRP can be identical, allowing the virtual IP to be used as the real IP of one of the routers in the VRRP group.

Question 9

QoS can be performed in which of the following modes? (Choose three.)

Accepted Answer

The answer of QoS can be performed in which of...

Question 10

In addition to traffic rate limit, the CAR can mark packets with colors. If one token bucket & one-rate is used in traffic policing and the number of tokens is insufficient, packets are marked with which of the following color?

Accepted Answer

When using a single token bucket and one-rate traffic policing, if there are insufficient tokens, packets are marked as "Red," indicating they are non-conformant and may be dropped.

Question 11

Which of the following statements are correct regarding default gateway of PC in the network running VRRP?

Accepted Answer

The default gateway for the PC in a network running VRRP should be the IP address of the virtual router. This ensures that traffic is always routed to the active router, regardless of which physical router is currently the master.

Question 12

Complex traffic classification matches packets with rules and then takes actions to matching packets.

Accepted Answer

Complex traffic classification involves analyzing network packets to determine their characteristics and then applying predefined rules to decide how to handle them, such as allowing, blocking, or prioritizing the traffic.

Question 13

IP QoS models include: (Choose three.)

Accepted Answer

The answer of IP QoS models include: (Choose three.)
...

Question 14

After the session is re-established between the BGP GR helper and its neighbor, original forwarding entries are deleted.

Accepted Answer

In BGP Graceful Restart (GR), the original forwarding entries are retained until the session is fully re-established to ensure continuous packet forwarding without disruption.

Question 15

Traffic shaping uses queues to cache traffic whose transmission rate exceeds the limit. Which of the following statement about traffic shaping is not true?

Accepted Answer

Traffic shaping does not increase the packet loss ratio during congestion; instead, it delays packets by queuing them, thus preventing packet loss.

Question 16

Which of the following statement about the jitter and delay is false?

Accepted Answer

The jitter is dependent on the delay. The higher the delay is, the more the jitter is.

Question 17

Which of the following statements about the device state change is correct after failure in the intermediate link for transmitting VRRP heartbeats?

Accepted Answer

When the intermediate link for transmitting VRRP heartbeats fails, both the master and slave devices may not receive heartbeat messages from each other, causing both to assume the Master state to ensure network continuity.

Question 18

Exhibit:  Based on the DSCP field (first 6 bits of the ToS field), packets can be classified into how many types?

Accepted Answer

The answer of Exhibit:  Based on the DSCP field...

Question 19

Which of the following technologies are available for traffic shaping? (Choose two.)

Accepted Answer

The answer of Which of the following technologies are available...

Question 20

WFQ can effectively control the delay and jitter by means of configuring weights for different services.

Accepted Answer

Weighted Fair Queuing (WFQ) assigns different weights to different traffic flows, allowing it to manage bandwidth allocation and control delay and jitter by prioritizing certain services over others.

Exam 5: HCNP-R&S Fast Track (Huawei Certified Network Professional - Routing & Switching Fast Track)