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H3C Constructing Secure optimized WANs v2.0 Sample Questions:

1. Regarding the echo in the VoIP telephone system, which of the following descriptions are correct ?

A) back sound into electrical echo and acoustic echo, electrical echo conventional telephone systems is mainly due to two, four-wire transducer impedance mismatch caused by
B) language voice gateway equipment itself does not bring new echo, but the IP network to bring network latency, increasing the echo time delay, leading to the original feel of the echo in VoIP become energy network The echo of being felt.
C) In VoIP networks, echo is related to the choice of encoding.The greater the compression ratio, the greater the relative echo in the network.
D) speech voice gateway device when performing analog to digital conversion may introduce echo, an echo suppression function but can be configured to reduce the impact on the voice gateway.

2. by the security gateway device displa ipsec sa command displays the following order information, the information is understood by ______ .
Interface: Serial0/2/1
path MTU: 1500
=========================== ====
-----------------------------
IPsec polic name: "1"
sequence number: 1
mode: isakmp
-----------------------------
connection id: 5
encapsulation mode: transport
perfect forward secrec: None
tunnel:
local address: 10.2.1.1
remote address: 10.2.1.2
Flow:
sour addr: 10.1.1.0/255.255.255.0 port: 0 protocol: IP
dest addr: 10.3.1.0/255.255.255.0 port: 0 protocol: IP
[inbound ESP SAs]
spi: 909448761 ( 0x36351639 )
proposal: ESP-ENCRPT-DES ESP-AUTH-MD5
sa remaining ke duration ( btes/sec ) : 1887435204/83
max received sequence-number: 19
udp encapsulation used for nat traversal: N
[outbound ESP SAs]
spi: 1583842120 ( 0x5e678348 )
proposal: ESP-ENCRPT-DES ESP- AUTH-MD5
sa remaining ke duration ( btes/sec ) : 1887435204/83
max sent sequence-number: 20
udp encapsulation used for nat traversal: N

A) This security policy IKE dynamic state of a negotiated key , the SPI , security protocols and algorithm parameters
B) This security policy works in tunnel mode
C) This security policy uses the ESP+AH encapsulation protocol
D) This security policy does not enable the NAT traversal function of IPSec/IKE

3. a H.323 gateway receives when registering with the gatekeeper RRJ message stating

A) network related parameters transmitted error
B) Net observe accepted the registration of the gateway
C) network gatekeeper refused to register the gateway
D) network gatekeeper registration request is being processed gateway

4. xz company requires to build its network based on modular enterprise network architecture. Z company in Shenzhen and Xi'an with 1 R & D base, with an office in Beijing and Shanghai ; at 23 with more than capital cities 50 person office ; the 200 has no more than smaller cities 8 people in a small office j There are usually more than 200 market and technical personnel on business trips at any given time .Due to environmental and cost issues, some offices cannot access the headquarters through dedicated lines or packet-switched wide area network connections.According to these circumstances, the network module that Z company should have is ____ .

A) VPN access into
B) Large type branch network
C) dedicated line / packet switched access
D) far away / distributed office network

5. The cable used in the Ethernet 1000BASE-LX standard is _______ The maximum transmission distance is ________ .

A) 2 pairs of STP twisted pair, 25m
B) 4 pairs of Category 3 UTP twisted pair, 100m
C) 4 pairs of Category 5 UTP twisted pair, 100m
D) multi- mode fiber, 550m
E) 2 pairs of Category 5 UTP twisted pair, 100m
F) single -mode optical fiber, 5000m

Solutions: