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Preparations of GB0-391 Exam 2021 H3CSE-Routing & Switching Unlimited 468 Questions
NEW QUESTION 41
G A good safety system should be _____ .
- A. of personnel in violation of the security regime of penalties
- B. Reward people who have long followed the safety system
- C. indeed ensure every job has its rules and regulations to follow
- D. ensure ensure safety system is capable of forming a virtuous cycle of continuous self-improvement
Answer: A,B,C,D
NEW QUESTION 42
Which of the following descriptions about GRE VPN configuration is correct is ____ .( Choose one or more )
- A. with home GRE VPN when, regardless of static routing or dynamic routing, the Tunnel interfaces should start Keepalive function, to detect the actual work of the tunnel interface
- B. After the keepalive function is enabled on the tunnel interface , by default, once the router fails to receive the keepalive message from the other party for three times , the tunnel is considered unavailable
- C. Tunnel source address and a destination address uniquely identifies an interface of a tunnel, at the ends of the tunnel Tunnel source address and destination address from the interface must be the same
- D. lack of provincial case, the Tunnel Interface packet encapsulation mode as GRE
Answer: B,D
NEW QUESTION 43
The CPE in the following options is ____ .
- A. cable mode m
- B. access the server
- C. access into the switch
- D. DSLAM
- E. Wide band router / modem
- F. machine top box
Answer: A,E,F
NEW QUESTION 44
How will the packets belonging to the same FEC be processed in the MPLS network ?
- A. In entering the MPLS network of LER are mapped on the same the MPLS label
- B. In the whole MPLS in the same network will be the LSP forwarding
- C. a packet passes LSR perform independent processing apparatus, the packet destination is IP address is different from the forwarding path may be different
- D. in LSR on the same label forwarding entry to forward
Answer: A,B,D
NEW QUESTION 45
Best-Effort model has the following features ?
- A. District Do not treat different types of business
- B. the number of broadband data streams, delay, jitter and packet loss controllable
- C. pass through queues implemented
- D. reality now simple.Save processing resources and fast processing speed
Answer: C,D
NEW QUESTION 46
The correct statement about malformed message defense is ______ .
- A. To defend against malformed message attacks, it is necessary to conduct targeted defense against the characteristics of each attack
- B. abnormal shaped TCP packet attack by TCP attacks flag is set to a specific value of the packets
- C. The ping of death attack uses oversized packets to attack
- D. Teardrop attacks use the loopholes of overlapping movement during UDP packet reassembly to attack
Answer: A,B,C,D
NEW QUESTION 47
Among the following tunneling technologies that do not have the function of data encryption are ______ .
- A. GRE
- B. L2TP
- C. MPLS-VPN
- D. IPSec tunnel
Answer: A,B,C
NEW QUESTION 48
Factors that affect VoIP voice quality include ______ .
- A. back sound
- B. choose a type of numbering
- C. selected by signaling type
- D. Packet loss on IP network
Answer: A,B,D
NEW QUESTION 49
Which of the following access methods does SSL VPN provide ?
- A. TCP access method
- B. WEB access method
- C. UDP access method
- D. IP access method
Answer: A,B,D
NEW QUESTION 50
The following belongs to the asymmetric key algorithm is ____ .
- A. DSA
- B. RSA
- C. DH
- D. DES
Answer: A,B,C
NEW QUESTION 51
The configuration commands on the MSR router are as follows:
acl number 2003
rule 0 permit source 192.168.0.0 0.0.0.255
#
traffic classifier 1operator or
if-match acl 2003
#
traffic behavior 1
filter den
#
qos polic 1
classifier 1behavior 1
#
interface GigabitEthernet0/1
port link-mode route
ip address 192.168.1.1 255.255.255.0
qos appl polic 2 outbound
Then, when the packets with the source addresses of 192.168.2.2 and 192.168.0.2 are forwarded from port G0/1 , the following statement is incorrect: ______
- A. Forwarding of packets with the source address of 192.168.0.2 is blocked
- B. Packets with the source address of 192.168.2.2 are forwarded normally
- C. Packets with the source address of 192.168.0.2 are forwarded normally
- D. Forwarding of packets with the source address of 192.168.2.2 is blocked
Answer: A,B
NEW QUESTION 52
In the SIP network, which of the following devices are not UA?
- A. SIP server
- B. IP phone
- C. language voice gateway
- D. connected to a common voice on the gateway PSTN phone
Answer: A,D
NEW QUESTION 53
Which of the following descriptions about L2TP tunnel ( Tunnel ) and L2TP session ( Session ) are correct is ____ .( Choose one or more )
- A. with one pair of LNS and LAC can only be established between a L2TP tunnel
- B. The L2TP session must be carried out after the L2TP tunnel is established
- C. L2TP session can be carried out before L2TP tunnel is established
- D. with one pair of LNS and LAC can establish one or more between the L2TP tunnel
Answer: B,D
NEW QUESTION 54
The correct statement regarding the defense of malformed messages is ______ .
- A. needles of ping of death attacks by detecting sensing Ping whether the request packet over a length of over 65536 bytes to discriminate whether the attack packets, if the length exceeds 65536 bytes, the packet will be discarded.
- B. needle for Teardrop , information may be cached fragment attack by class, each source, the purpose of the IP , the packet ID the same set of configuration, the maximum cache 10,000 groups , the data in the buffer reaches a maximum when directly discards fragmented, while According to the cached fragmentation information, analyze the legitimacy of IP packet segmentation, and directly discard illegal IP packets to resist attacks
- C. abnormal shaped packet attacks targeted defense needs for each attack
- D. needle deformity TCP packet attack, by determining TCP determines whether the packet is a packet attack packet flag for .6 flag bits are all 1 or .6 flag bits are all is 0 or SN and FIN simultaneously It is a packet discards
Answer: A,B,C,D
NEW QUESTION 55
The following functions of the convergence layer are ____ .( Choose one or more )
- A. owns a large number of interfaces, and for the final connected user computer
- B. access into the security control
- C. High -speed packet-switched
- D. complex routing strategies complicated
Answer: D
NEW QUESTION 56
The means of business isolation in the local area network are ______ .
- A. Super VPN
- B. VLAN
- C. mixed together port
- D. PVP
Answer: A,B,C,D
NEW QUESTION 57
The changes of MP-BGP protocol relative to BGP protocol include
- A. The new increase Extended Communities attribute
- B. The new increase MP REACH NLRI attribute
- C. The new increase MP UNREACH NLRI attribute
- D. new growth VPNv4 address family
Answer: A,B,C,D
NEW QUESTION 58
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