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Huawei HCIE-Security (Huawei Certified Internetwork Expert-Security) Sample Questions:

1. For some large IP data packets, in order to meet the requirements of the MTU (Maximum Transmission Unit) of the link layer, it needs to be fragmented and divided into several IP packets during the transmission process. In each IP header there is an offset field and a split flag (MF), where the offset field indicates the location of the fragment in the entire IP packet. If the attacker sets the offset field to an incorrect value after intercepting the IP data packet, the receiver cannot correctly combine the values of the offset field in the data packet after receiving the split data packets. In this way, the receiver will keep trying, and the operating system will crash due to resource exhaustion.
What is this attack method?

A) Ip Fragmented Packet Attack
B) WinNuke Attack
C) TCP packet flag attack
D) Teardrop Attack

2. As shown in the figure below, a company uses the USG6600 firewall as the egress. The company has two egresses. Carrier A and carrier B share the egress load. When an engineer deploys the firewall, two egresses are added to the untrust zone at the same time. The user has joined the trust zone and made source NAT mapping. After the deployment, it is found that some users have normal access to the Internet, while some users have very slow access to the Internet, and even sometimes cannot access the Internet.
[USG] display firewall session table verbose
http VPN: public --> public
Zone: trust --> untrust TTL: 00:00:10 Left: 00:00:08
Interface: GigabitEthernet0/0/0 Nexthop: 41.134.5.49 MAC: F0-DE-F1-69-26-91
<--packets: 9 bytes: 364 -->packets: 9 bytes: 364
10.16.1.20:5246 [41.134.5.52:5246] --> 16.8.3.8:80
http VPN: public --> public
Zone: trust --> untrust TTL: 00:10:00 Left: 00:09:59
Interface: GigabitEthernet0/0/1 Nexthop: 41.160.30.65 MAC: 00-21-97-cf-22-38
<--packets: 4 bytes: 238 -->packets: 14 bytes: 1640
10.16.1.122:3745 [41.134.5.52:3745] --> 2.2.2.2:80
[USG] display ip routing-table
20:56:07 2012/09/30
Route Flags: R - relay, D - download to fib
Routing Tables: Public
Destinations: 5 Routes: 5
Destination/Mask Proto Pre Cost Flags NextHop
0.0.0.0/0
Static 60
0
RD 41.134.5.49
0.0.0.0/0
Static
60
0
RD 41.160.30.65
10.16.1.1/24
Direct
0
0
D 127.0.0.1
127.0.0.0/8
Direct
0
0D 127.0.0.1
127.0.0.1/32
Direct
0
0
D 127.0.0.1
Based on the above information, please determine which of the following descriptions is correct?

A) The issue is related to carrier network stability.
B) The problem is caused by an equal-cost route.
C) It can be inferred that the source NAT configuration is correct.
D) The problem is caused by the user's PC.

3. A Web Server deployed in the DMZ area of an enterprise has an intranet IP address of 10.1.1.3 and a port of 8080. The public network address announced to the outside world is 1.1.1.2, and the external port number is 80.
Configure the following commands on the firewall:
[USG6600] security-policy
[[USG6600-policy-security] rule name untrust_to_mz
[USG6600-policy-security-rule-untrust_to_mz] source-zone untrust
[USG6600-policy-security-rule-untrust_to_mz] destination-zone dmz
[USG6600-policy-security-rule-untrust_to_mz] destination-address 1.1.1.2 32
[USG6600-policy-security-rule-untrust_to_mz] service http
[USG6600-policy-security-rule-untrust_to_mz] action permit
[USG6600] nat server webserver protocol tcp global 1.1.1.2 www inside 10.1.1.3 8080
The external network PC cannot access the Web Server of 10.1.1.3 within the enterprise. Please analyze the most likely reasons for this:

A) Firewall should be configured as nat server webserver protocol tcp global 1.1.1.2 80 inside 10.1.1.3 8080
B) Firewall untrust to DMZ zone security policy should be configured as service 8080
C) The firewall does not open the default packet filtering policy from the untmut zone to the dmz zone
D) Firewall untrust to DMZ zone security policy should be configured as destination-address 10.1.1.3 32

4. Which of the following commands cannot be backed up in the command backup function of the firewall's dual-system hot backup?

A) IPS command
B) Forwarding Policy Commands
C) routing table
D) IP address configuration

5. Regarding the firewall NAPT technology, the following description is incorrect:

A) When configuring NAPT on the firewall, the security policy should match the IP address after address translation.
B) NAPT can theoretically achieve 65535 private network addresses sharing a public network address to access the public network.
C) NAPT translates both the source IP address and the source port number.
D) NAPT is a technique for extending Layer 3 addresses with Layer 4 information.

Solutions: