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2021 Mar JN0-633 book

Q71. What is the default action for an SRX device in transparent mode to determine the outgoing interface for an unknown destination MAC address?

A. Perform packet flooding.

B. Send an ARP query.

C. Send an ICMP packet with a TTL of 1.

D. Perform a traceroute request.

Answer: A

Explanation: Reference: http://www.juniper.net/techpubs/software/junos-security/junos-security95/junos-security-swconfig-interfaces-and-routing/understand-l2-forwarding-tables-section.html


Q72. You want to route traffic between two newly created virtual routers without the use of logical systems using the configuration options on the SRX5800.

Which two methods of forwarding, between virtual routers, would you recommend? (Choose two.)

A. Use a static route to forward traffic across virtual routers using the next-table option. Enable the return route by using a RIB group.

B. Create static routes in each virtual router using thenext-tablecommand.

C. Use a RIB group to share the internal routing protocol routes from the master routing instance. 

D. Connect a direct cable between boo physical interfaces, one in each virtual router and use static routes with thenext-hopcommand.

Answer: B


Q73. Your SRX device is performing NAT to provide an internal resource with a public address. Your DNS server is on the same network segment as the server. You want your internal hosts to be able to reach the internal resource using the DNS name of the resource.

How do you accomplish this goal?

A. Implement proxy ARP.

B. Implement NAT-Traversal.

C. Implement NAT hairpinning.

D. Implement persistent NAT.

Answer: A

Explanation:

Reference :http://www.juniper.net/techpubs/software/junos-security/junos-security96/junos-security-swconfig-security/prxy-arp-nat_srx.html


Q74. Which two statements are true about an interconnect logical system on an SRX Series device? (Choose two.)

A. VXLAN is used to switch inter-LSYS-traffic.

B. The root and user LSYSs connect to the interconnect LSYS usingvtinterfaces.

C. VPLS is used to switch inter-LSYS traffic.

D. The root and user LSYSs connect to the interconnect LSYS usingltinterfaces.

Answer: C,D


Q75. You are using destination NAT to translate the address of your HTTPS server to a private address on your SRX Series device. You have decided to implement IDP SSL decryption. Upon enabling the decryption, you notice sessions are not decrypted.

Which action resolves the problem?

A. Replace the server SSL certificate to use the public address.

B. Reboot the SRX Series device.

C. Increase the SSLsession-id-cache-timeoutvalue to any value greater than 5000 seconds.

D. Enable the IDPsensor-configurationdetector to detect address translation.

Answer: D


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Q76. Click the Exhibit button.

user@host> show security ike security-associations

Index State Initiator cookie Responder cookie ModeRemote Address 3271043 UP7f42284089404673 95fd8408940438d8 Main 172.31.50.2

user@host> show security ipsec security-associations

Total active tunnels: 0

user@host> show log phase2

Feb 2 14:21:18 host kmd[1088]: IKE negotiation failed with error: TS unacceptable. IKE Version: 1, VPN: vpn-1 Gateway: gate-1, Local: 172.31.50.1/500, Remote: 172.31.50.2/500, Local IKE-ID: 172.31.50.1, Remote IKE-ID: 172.31.50.2, VR-ID: 0

Feb 2 14:21:18 host kmd[1088]: KMD_VPN_TS_MISMATCH: Traffic-selector mismatch, vpn name: vpn-1, Peer Proposed traffic-selector local-ip: ipv4(2.2.2.2), Peer Proposed traffic-selector remote-ip: ipv4 (1.1.1.1)

Feb 2 14:21:54 host kmd[1088]: IKE negotiation failed with error: No proposal chosen. IKE Version: 1, VPN: vpn-1 Gateway: gate-1, Local:

172.31.50.1 /500, Remote: 172.31.50.2/500, Local IKE-ID: 172.31.50.1, Remote IKE-ID:

172.31.50.2 , VR-ID: 0

Feb 2 14:22:19 host kmd[1088]: KMD_VPN_TS_MISMATCH: Traffic-selector mismatch, vpn name: vpn-1, Peer Proposed traffic-selector local-ip:

ipv4 (2.2.

2.2), Peer Proposed traffic-selector remote-ip: ipv4(1.1.1.1)

You have recently configured an IPsec VPN between an SRX Series device and another non-Junos security device. The phase one tunnel is up but the phase two tunnel is not present.

Referring to the exhibit, what is the cause of this problem?

A. preshared key mismatch

B. mode mismatch

C. proposal mismatch

D. proxy-ID mismatch

Answer: D


Q77. You are asked to implement a monitoring feature that periodically verifies that the data plane is working across your IPsec VPN.Which configuration will accomplish this task?

A. [edit security ike] user@srx# show policy policy-1 { mode main;

proposal-set standard;

pre-shared-key ascii-text "$9$URiqPFnCBIc5QIcylLXUjH"; ## SECRET-DATA

}

gateway my-gateway { ike-policy policy-1; address 10.10.10.2; dead-peer-detection;

external-interface ge-0/0/1;

}

B. [edit security ipsec] user@srx# show

policy policy-1 { proposal-set standard;

}

vpn my-vpn {

bind-interface st0.0; dead-peer-detection; ike {

gateway my-gateway; ipsec-policy policy-1;

}

establish-tunnels immediately;

}

C. [edit security ike] user@srx# show policy policy-1 { mode main;

proposal-set standard;

pre-shared-key ascii-text "$9$URiqPFnCBIc5QIcylLXUjH"; ## SECRET-DATA

}

gateway my-gateway { ike-policy policy-1; address 10.10.10.2; vpn-monitor;

external-interface ge-0/0/1;

}

D. [edit security ipsec] user@srx# show policy policy-1 { proposal-set standard;

}

vpn my-vpn {

bind-interface st0.0; vpn-monitor;

ike {

gateway my-gateway; ipsec-policy policy-1;

}

establish-tunnels immediately;

}

Answer: D

Explanation: Reference: https://www.juniper.net/techpubs/en_US/junos11.4/information-products/topic-collections/security/software-all/monitoring-and-troubleshooting/index.html?topic- 59092.html


Q78. Which statement is true regarding destination NAT?

A. Destination NAT changes the content of the source IP address field.

B. Destination NAT changes the content of the destination IP address field.

C. Destination NAT matches on the destination IP address and changes the source IP address.

D. Destination NAT matches on the destination IP address and changes the source port.

Answer: B


Q79. Your company's network has seen an increase in Facebook-related traffic. You have been asked to restrict the amount of Facebook-related traffic to less than 100 Mbps regardless of congestion.

What are three components used to accomplish this task? (Choose three.)

A. IDP policy

B. application traffic control

C. application firewall

A. D. security policy

E. application signature

Answer: B,D,E

Explanation:

An IDP policy defines how your device handles the networktraffic.It will not limit the rate. Reference:http://www.juniper.net/techpubs/software/junos-security/junos-security96/junos-security-swconfig-security/idp-policy-overview-section.html)

Application Firewallenforces protocol and policy control at Layer 7. It inspects the actual content of the payload and ensures that it conforms to the policy, rather thanlimiting the rate.

Reference:http://www.juniper.net/techpubs/en_US/junos12.1x44/topics/concept/application-firewall-overview.html


Q80. How does the SRX5800, in transparent mode, signal failover to the connected switches?

A. It initiates spanning-tree BPDUs.

B. It sends out gratuitous ARPs.

C. It flaps the impaired interfaces.

D. It uses an IP address monitoring configuration.

Answer: B