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Juniper SEC,Specialist(JNCIS-SEC) Sample Questions:

1. An attacker sends a low rate of TCP SYN segments to hosts, hoping that at least one port replies. Which type of an attack does this scenario describe?

A) port scanning
B) IP address sweep
C) DoS
D) SYN flood

2. Click the Exhibit button.
[edit security]
user@host# show
zones {
security-zone ZoneA {
tcp-rst;
host-inbound-traffic {
system-services {
ping;
telnet;
}}
interfaces {
ge-0/0/0.0;
ge-0/0/1.0;
}}
security-zone ZoneB {
interfaces {
ge-0/0/3.0;
}}}
policies {
from-zone ZoneA to-zone ZoneB {
policy A-to-B {
match {
source-address any;
destination-address any;
application any;
}
then {
permit;
}}}}
In the exhibit, a host attached to interface ge-0/0/0.0 sends a SYN packet to open a Telnet
connection to the device's ge-0/0/1.0 IP address.
What does the device do?

A) The device silently discards the packet.
B) The device sends back a TCP reset packet.
C) The device responds with a TCP SYN/ACK packet and opens the connection.
D) The device forwards the packet out the ge-0/0/1.0 interface.

3. Click the Exhibit button.
user@host> show interfaces ge-0/0/0.0 | match host-inbound Allowed host-inbound traffic : ping ssh telnet
Which configuration would result in the output shown in the exhibit?

A) [edit security zones security-zone trust]
user@host# show
host-inbound-traffic {
system-services {
ssh;
ping;
telnet;
}}
interfaces {
ge-0/0/3.0 {
host-inbound-traffic {
system-services {
ping;
}}}
ge-0/0/0.0;
}
B) [edit security zones security-zone trust]
user@host# show
host-inbound-traffic {
system-services {
ping;
telnet;
}}
interfaces {
ge-0/0/0.0 {
host-inbound-traffic {
system-services {
ssh;
telnet;
}}}}
C) [edit security zones functional-zone management]
user@host# show
interfaces {
all;
}
host-inbound-traffic {
system-services {
all;
ftp {
except;
}}}
D) [edit security zones functional-zone management]
user@host# show
interfaces {
all {
host-inbound-traffic {
system-services {
ping;
}}}}
host-inbound-traffic {
system-services {
telnet;
ssh;
}}

4. Your task is to provision the JUNOS security platform to permit transit packets from the
Private zone to the External zone by using an IPsec VPN and log information at the time of
session close.
Which configuration meets this requirement?

A) [edit security policies from-zone Private to-zone External]
user@host# show
policy allowTransit {
match {
source-address PrivateHosts;
destination-address ExtServers;
application ExtApps;
}
then {
permit {
tunnel {
ipsec-vpn VPN;
}}
log {
session-close;
}}}
B) [edit security policies from-zone Private to-zone External]
user@host# show
policy allowTransit {
match {
source-address PrivateHosts;
destination-address ExtServers;
application ExtApps;
}
then {
permit {
tunnel {
ipsec-vpn VPN;
log;
count session-close;
}}}}
C) [edit security policies from-zone Private to-zone External]
user@host# show
policy allowTransit {
match {
source-address PrivateHosts;
destination-address ExtServers;
application ExtApps;
}
then {
permit {
tunnel {
ipsec-vpn VPN;
}
}
log {
session-init;
}}}
D) [edit security policies from-zone Private to-zone External]
user@host# show
policy allowTransit {
match {
source-address PrivateHosts;
destination-address ExtServers;
application ExtApps;
}
then {
permit {
tunnel {
ipsec-vpn VPN;
}}
count {
session-close;
}}}

5. Regarding a route-based versus policy-based IPsec VPN, which statement is true?

A) A route-based VPN cannot have a deny action in a policy; a policy-based VPN can have a deny action.
B) A route-based VPN generally uses less resources than a policy-based VPN.
C) A route-based VPN is better suited for dialup or remote access compared to a policy-based VPN.
D) A route-based VPN uses a policy referencing the IPsec VPN; a policy-based VPN policy does not use a policy referencing the IPsec VPN.

Solutions: