Intrvw: Difference between revisions
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Line 1:
= Google GCP Workspaces =
* Code:
<syntaxhighlight lang='python'>
with open('tab.txt','r') as tab, open('csv.txt','r') as csv, open('data.txt','w') as data:
for line in tab.readlines():
data.write(' '.join(line.strip().split('\t'))+'\n')
for line2 in csv.readlines():
data.write(' '.join(line2.strip().split(','))+'\n')
data.close()
with open('data.txt','r') as file:
for line in file.readlines():
print(line)
</syntaxhighlight>
* Code2:
<pre>
def analyze(numbers):
result = []
index = {}
min = None
max = None
for n in numbers:
index[n] = True
if not max or n > max:
max = n 9
if not min or n < min:
min = n 0
for n in range(min + 1, max):
if not n in index:
result.append(n)
return result
analyze()
4,5,6,7,8
3rd
0—-
analyze([5,9])
(6,9)
result = [6,7,8]
analyze([3,0,5,9])
4,3
Result = [1,2,4,6,7,8]
</pre>
* Equivalent Code:
<pre>
def analyze(numbers):
min = None
max = None
for n in numbers:
print(n)
if not max or n > max:
max = n
if not min or n < min:
min = n
print("max: ",max," min: ",min)
</pre>
* Results:
<pre>
>>> analyze([3,0,5,9])
3
max: 3 min: 3
0
max: 3 min: 0
5
max: 5 min: 5
9
max: 9 min: 5
</pre>
* Logic:
<pre>
>>> min = None
>>> not min
True
>>> min = 0
>>> not min
True
</pre>
* Working code for Min & Max:
<pre>
def analyze(numbers):
min = 0
max = 0
for n in numbers:
print(n)
if n > max:
max = n
if n < min:
min = n
print("max: ",max," min: ",min)
</pre>
= Amzn SysDE II =
* Recover from below issue:
chmod -x /bin/chmod
# Copy
# tar -file
# ld
* Coding
<syntaxhighlight lang='python'>
## Write a function that gives you the average latency in a log file with the following format
#
# timestamp requestid operation latency
# 2021-01-20T08:19:18+00:00 123e4567-e89b-12d3-a456-426614174000 getresults 175
# 2021-01-20T08:19:20+00:00 123e4567-e89b-12d3-a456-426614174100 submitquery 100
# 2021-01-20T08:19:21+00:00 123e4567-e89b-12d3-a456-426614174200 getquerystatus 60
# 2021-01-20T08:20:03+00:00 123e4567-e89b-12d3-a456-426614174300 getresults 150
# 2021-01-20T08:22:09+00:00 123e4567-e89b-12d3-a456-426614174400 cancelquery 20
}
path = input('')
#path = '/var/log/messages'
r = []
with open(path,'r') as file:
for line in file:
r.append(line.split()[-1])
avg_Latency = sum(r)/len(r)
print(avg_Latency)
--------------------------------------
#path = input('')
def avg_lat(path):
#a = 0
#rr = 0
latency = {}
occurrence = {}
with open(path,'r') as file:
for line in file:
try:
c = line.split()[-1]
if int(c):
#a += 1
#rr = rr + int(c)
latency['getresults']
oper.update({line.split()[-2]:line.split()[-1]})
except:
pass
latency = {
'getresults': 455,
'submitquery': 678
...
}
occurrences = {
'getresults': 4,
'submitquery': 9
}
latency.get('getresults')
#return (rr/a)
avg_lat('/var/log/syslog')
</syntaxhighlight>
;Debrief
<pre>
feedback - team liked, pleasure in interview
strong NW
stron linux
LP fine
L4 is not good for you
System design not good
DB using indexing, Queues, scalable, parallel approach, LB using, indexing DBs, instead of storage.
Coding was also OK, difficulty with dictionary
Should know Datastructures not algorithms
Try again in 6 months, ask HR & try to get exception.
</pre>
* Correct Code:
<pre>
latency ={}
occurrance = {}
with open('latency2.logs','r') as file:
for line in file:
lat = int(line.split()[-1])
oper = line.split()[-2]
if oper in latency.keys():
add_latency = latency.get(oper) + lat
occurrance.update({oper:occurrance.get(oper)+1})
else:
add_latency = lat
occurrance.update({oper:1})
latency.update({oper:add_latency})
print(latency)
print(occurrance)
for k,v in latency.items():
print(k,int(v/occurrance.get(k)))
</pre>
= MasterCard =
* SSL Handshake
* TCP 3-Way Handshake
* TLS 1.0 vs TLS 3.0
* curl -kv (meaning of k)
* HTTP
= Microsoft =
;HM Round:
* State a Work process you changed
* Mention a time when you worked with a Cross functional team
* Mention a time when you tried to understand the Customer needs in a better way.
; Scripting Round
* Write a code to:
- Check how many IP addresses from a range are online
- Login into one of them & perform traceroute to each & save output to <IP>_traceroute.txt file
- Login into each and save output of ipconfig/all & nbtstat to a file called <IP>_config.txt
* Program with AND/OR function operations
* What is a Pull Request? (Merge branch into Main branch)
* What is a Class? (Datatype eg: string - Cat, Sub, etc functions)
; Networking Round
* NTP Strutum
* Vlan turking - switchport mode trunk without impact
-> allowed VLAN command
* Difference between BGP default info orig & default orig
* OSPF AD? eBGP/iBGP AD?
* BGP port no, States, Attributes
* OSI Model
= AMZN Networking =
Line 180 ⟶ 442:
Srv3 is slow, latency, how to troubleshoot? top, free -h, df -h
How to check traffic requests coming per second? netstat -s, ss -s, tcpdump
= AMZN Sydney NDE =
;Round 1
*OSPF
OSPF States
OSPF LSAs
'''Type 4 LSA Details'''
'''Type 3 LSA Details'''
'''Route Selection Hierarchy - E1, E2, N1, N2'''
Looping prevention in OSPF 1) Only best route selected in SPF; 2) All Areas must connect to Backbone Area.
'''ABR has 2 DB Tables for 2 interfaces each in different areas, each learning same route with same cost, how will best path be selected.'''
'''How is route removed in OSPF, What is there in LSU?'''
*BGP
Loop prevention method for eBGP(AS Path list own AS Number, route removed)
'''Loop prevention method for iBGP'''
To avoid routing information loops within the same AS, all IBGP routers must peer with every router within AS
Only TCP sessions required, not physical connections) – this is called full mesh IBGP.
IBGP uses split horizon rule (covered in other article), which states that routes learned from one IBGP neighbor is never sent to the rest of IBGP neighbors.
That way, when you have full mesh IBGP, routing information loops will not occur, because all routers have the same routing information.
Attributes for affecting Outbound traffic? '''MED & Local Preference?'''
'''Attributes for affecting Inbound traffic?'''
*Linux
High CPU Troubleshooting
Commands: GREP, AWK, SED
Case/Implementation you worked - NSM repro, SIP Asterisk repro
Scripting/Automation example - Top VS list
;Round 2
* Load Balancer
Explain LB usage in detail
How it distributes connections from TCP prospective?
How is connection initiated & how it reaches Server?
Can LB use VIP to connect to Server?
'''When in Citrix Netscaler it uses VIP as source IP for connecting to Server?'''
* BGP
Scenario for eBGP:
|-----[R2]-------|
[A]-----[R1] [R4]----[B]
|-----[R3]-------|
'''How is maintenance done in R2?'''(ASPath Prepend and Local_Pref)
Shutdown command? not preferred, disruptive way
Local Pref? Nope
Med? Nope
'''IS local Pref used in eBGP?'''
'''Where is MED set on? (Med cannot be used in eBGP)'''
''AS-Path prepend:'' Way to add AS number to the list of subnet u want to advertise.
This is a way to route poisoning.
Tell the outside world not to follow the path.
Applied outwardly.
Impacts incoming path.
''Local preference:'' Applied while the traffic coming inside.
Impacts traffic while going out.
Non transitive.
Propagates within the AS-Path.
Higher is preferred
''MED:'' When your router has connection with two other routers with same AS.
Let's say you have 2 subnets behind your router.
You can use MED value to mention which networks should be accessed through which links.
It is advertised outwards.
Impacts the incoming traffic.
Semi transitive.
Propagates to one AS.
Lower is preferred
Should be used carefully as it reduces network resiliency.
Can we do Load balancing across R2 & R3? (ECMP?)
Loop Prevention in eBPG?
Loop prevention in iBGP? For above Scenario? (Split Horizon, do not advertize to other iBGP peers, but learn directly from neighbor)
Need for a direct connection b/w R1 & R4? What if not possible? (Run IGP)
How Router Reflector prevents loops (using RR, RR Clients, Non-Client Peers)
'''When will a router received be discarded:'''
Originator-ID same as own Router-id(the route is discarded in this case)
Originator-ID different from Router-ID
* Python
Skill you learned in past 12 months? Python
Describe a project you worked on in Python?
How did you learned Python?
* Scenario 1
[PC]-------[Branch India]-------------------------------[HQ US]------------[Update Server]
How does PC reach Server for updates? Explain all steps - ARP, DHCP,DNS, TCP, HTTP(GET) , etc
If Download is Slow, how will you troubleshoot?
Where will you take captures? (All devices)
Which device's captures will you see Retransmissions? (All)
TCP Slow Start?
What happens if TCP Packet is lost?
Will Latency cause slowness?
If 1 server is in US & Another is in India with same BW, will the download time change?
If so, how much?
* Scenario 2
[PC]------[SW]-------[Router]------[DNS Server]
Captures on Switch, what will be Source & Dest IP as well as MAC?
= AMZN NDE =
* Steps to upgrade 10 Routers safely.
* iBGP vs OSPF
* Loop avoidance in OSPF
* What are OSPF Areas?
* RIB vs FIB
* Can BGP COnverge as fast as OSPF
* iBGP Loop avoidance
* What direction is AS PAth Prepend applied?
* WSF, why it is just 65535?
* Collision avoidance
* How is congestion detected? (RTO & 3 Dup ACKs)
;Q. Write a function to verify if a given set of interfaces is present as next-hops for a given prefix in router's routing table.
Task:
* Implement function: check_prefix_next_hops("router-1", "216.182.232.249/32", ["bond1", "bond3"])
* Function must return True/False
* Use example router output from MOCKED_DEVICE_DATA object
<syntaxhighlight lang="python">
MOCKED_DEVICE_DATA = {
"router-1": """
B>* 216.182.232.249/32 [200/0] via 100.92.0.1, bond1, 00:14:14
* via 100.92.0.3, bond3, 00:14:14
C>* 253.4.0.232/31 is directly connected, jrp2-1
B> 30.0.0.0/8 [200/0] via 100.92.188.32 (recursive), 00:00:25
* via 100.92.64.3, bond2, 00:00:25
via 100.92.188.64 (recursive), 00:00:25
* via 100.92.64.5, bond3, 00:00:25""",
"router-2": None
}
#int = ['bond0','bond1']
#for k,v in x.itemm():
# print(k,v)
# if k == "router-1"
#def check_prefix_next_hops("router-1", "216.182.232.249/32", ["bond1", "bond3"])
def check_prefix_next_hops(router_name, given_prefix, expected_next_hop_interfaces):
#for k,v in r
router_output = MOCKED_DEVICE_DATA[router_name]
if given_prefix in router_output:
for i in range(len(expected_next_hop_interfaces)):
if expected_next_hop_interfaces[i] ==
</syntaxhighlight>
= AMZN SysDE =
;1. Extract Timeout & Desination IP address information from a log file
* The log file is in text format having 2 elements:
- timeout always present either 1 or 0
- dest IP address
* Big annotation
* What will happen if you do not close the file in python & program crashes?
* Is there a way to close files automatically?
;2. Script to print duplicate files from a directory
* How to run a Unit Test(performance test) on this script?
* Why not use a Dict?
<pre>
# Read the file
f = open('/var/log/apache2/access.log','r')
lines = f.readlines()
f.close()
print(len(lines))
# Append Response code & Dest IP address to 'a'
a = []
for i in lines:
a.append((i.split()[0], i.split()[8]))
print(len(a))
# Create a set of IP addresses 'b'
b=[]
for i in a:
b.append(i[0])
b = set(b)
print(len(b))
# Create a new list having Unique IP addresses & list of Responses for each:
c=[]
for i in b:
x = []
for j in range(len(a)):
if i == a[j][0]:
x.append(a[j][1])
c.append((i,x))
print(len(c))
# Print the results:
for k in range(len(c)):
print(c[k][0],len(c[k][1]))
</pre>
= Google =
{{UC}}
== Challenge ==
{{UC}}
= Google Dublin =
;Round 1
{{UC}}
;Round 2
{{UC}}
= CouchBase =
Line 1,015 ⟶ 1,503:
What changes are required in the Firewalls for NAT-T?
Screening options? Name of 3 Attacks? SYN Flood attack limit? UDP attack limit?
= Mphassis =
When Next-hop lookup take place in ScreenOS flow? After policy lookup or at Arp lookup?
Silly window protocol
URG vs PUSH Flags
Urgent pointer
ARP in ipv6
IKE v2
Active vs Passive FTP - ALG
Overlapping subnets without NAT
ospf v6
ipv6
Netscreen session analyzer
AH vs ESP in Wireshark
DHCP
DHCP Relay agent
2 DHCP servers in a subnet/Network
Hub and Spoke VPN - Policies
Tracert in Windows vs Linux - Tracert using UDP
On Unix-like operating systems, the traceroute utility uses User Datagram Protocol (UDP) datagrams by default, with destination port numbers ranging from 33434 to 33534.
The traceroute utility usually has an option to instead use ICMP Echo Request (type 8) packets, like the Windows tracert utility does, or to use TCP SYN packets.
Tracert 3 values
4 way handshake- Benefits
ALG opens:
Pasv - in passive mode opens port
Port - in active mode opens port
Diff bw ACL & Poloicy? ACL is at Interface level;Policy at Zone;;ACL= network/transport layer;Pol=ALG=Application layer
Session layer handles Dialog control.
How to block P2P?
= Accenture =
VR vs VSYS
What are UTM Features?
Can you assign 4 zones to 4 VRs? What routes need to be configured?
Ans: Trust-vr to Untrust-vr default route already exists by default, need to create a Reverse route.
Migration plan for ScreenOS to SRX?
VPN Migration
OSPF areas, type 7
BGP route selection
BGP route reflectors
What is PFS?
What is DH protocol? How it works? WHich versions are supported in ScreenOS?
What are phase 1 stages
Tunnel interface
Flow in ScreenOS
What is ALG?
;2nd level
What is a VPN?
ESP vs AH?
How NSRP Failover occurs?
What is a Null Route?
What is a Cookie? How is Cookie Calculated?
What is a Control & Data Link?
What is NSRP Lite?
NSRP Virtual MAC Calculation?
Proxy-ID? Which Phase?
What is VSI? VSD? How is VSI assigned? (eth0/0:1)
Can we assign IP to HA Interface?
What is a Management Port? Can it have User/Passthrough Data?
How do you create a Zone?
Select Layer 2 or 3
Select VR
Priority order of VIP, Source Nat, Dest NAT, Policy NAT?
Default NSRP Priority?
100
What is RTO?
What is FSTAB? min space for booting a device?
Functions of DevSrv?
NSM Distributed Architecture?
What is a VLAN? Duplex? Collision? Trunk?
What is rsync? Where is it used in NSM?
Difference between rsync & SCP?
Scp basically reads the source file and writes it to the destination.
It performs a plain linear copy, locally, or over a network. Use scp for your day to day tasks.
Commands that you type once in a while on your interactive shell.
Its simpler to use, and in those cases rsync optimizations won't help much.
Scp has only a few switches.
Rsync also copies files locally or over a network.
But it employs a special delta transfer algorithm and a few optimizations to make the operation a lot faster.
Rsync has a plethora of command line options, allowing the user to fine tune its behavior.
It supports complex filter rules, runs in batch mode, daemon mode, etc.
For recurring tasks, like cron jobs, use rsync.
It will take advantage of data already transferred, performing very quickly and saving on resources.
It is an excellent tool to keep two directories synchronized over a network.
NSRP supported in Transparent Mode?
Yes, When operating in Transparent mode, the backup in an Active/Passive pair can only be managed from one Layer 2 zone at a time. By default, this zone is V1-Trust. If management is needed from V1-Untrust, V1-DMZ, or a custom layer 2 zone, use the command:
set interface vlan1 nsrp manage zone <zone name>
Note: This command must be enabled on both devices in the NSRP cluster. Verify:
get interface vlan1
In backup mode, only traffic from V1-TRUST can manage the box Note: Ensure that the manage-ip addresses are different for both the primary and backup firewalls.
NSRP States? What is Inoperable state?
OSPF Areas? Type 7 LSA? In backbone converts to what?
Difference between init 0 & init 6?
= Tech M =
V,E,B bit in OSPF
LSA area 2,0,1
LSA Type 3 -6 routers in area 2
Type 3 LSA area 1-0-2 changes?
L2TP VPN Flow?
No of Junos Candidate configs?
= BT Interview =
vip vs nat-dst diff?
Ans: Vip needs same subnet IP as interface IP
diff policy vpn vs route vpn?
encrytion at which packet during vpn Aggr /main mode?
diff bw main and aggr mode?
More secure which 1 ?
Ans: IKE ID (name) is sent in plain text in Aggressive mode & encrypted in main mode.
Intrazone block option?
Mip has no port translation
Route based VPN : 1) has tunnel 2) NAT Dest supported.
What are the IKE v2 benefits?
NSM Services ==> HASrv, DevSrv, GuiSrv
If all devices seems to be down in NSM ==> DevSrv service is down
Requirements for NSRP Active-Active? VSI interfaces config
Change timeout value of a Predefined service - Yes, Possible by editing the service.
Life Size, key change after 100Mb data transfer? Cisco 1 GB? Juniper?
Life Size is in which phase? Phase 2 only. Life time is in both Phase 1 & 2.
Vsys config
SSG 550M ==> what is meaning of M? = can be converted to Junos J-series Services Route
Enable ALG on a custom service? Create policy, select custom Service & select Application to select the ALG.
Can you create a VPN with overlapping subnets using Policy based VPN?
What is Rommon/Bios in ScreenOS called?
Ans: Bootloader
ScreenOS vs SRX
What is difference between 8,2 & 8.3 Cisco ASA firmware?
8.2 packet arrives - check ACL before un-natting ==> create ACL with translated IP not real
2 nats> static or GLobal
8.3 object Natting ==> instead of calling, calling object in ACL ==> ASA will do NAT first & ACL should be added for real IP.
Object or Twice NAT.
IPv6 is supported in ScreenOS or not?
= McAfee =
packt filter fw
stateful fw
scenario: reverse traffic
tcp 3way -flags
What is flow control?
ospf vs rip differences
port no of http,dns,https,etc
what is dns?
chown
chmod
Disk usage - df -h
System resources - top, pstree
SMTP Test with Telnet:
dig example.com mx
nslookup -query=mx example.com
mx1.example.com
mx2.example.com
telnet mx1.example.com smtp
HELO client.example.com
MAIL from: <sender@example.com>
RCPT to: <recipient@example.com>
DATA
From: sender@example.com
To: recipient@example.com
Subject: Test message
This is a test message.
QUIT
HTTP test using telnet:
To retrieve the document as well as the headers, use GET instead of HEAD. If you want the root document, use GET / HTTP/1.1 (or HEAD / HTTP/1.1).
telnet www.example.com http
HEAD /example/example.shtml HTTP/1.1
Host: www.example.com
Connection: close
= TechM (Chd) =
* SRX fxp1 interface
For SRX240B:
ge-0/0/0 interface will be mapped to fxp0 (out-of-band management)
ge-0/0/1 interface will be mapped to fxp1 (control).
The interfaces that are mapped to fxp0 and fxp1 are device specific.
* IPS blocked webmail. Where to get the alerts?
Analysis & Reporting > IPS > Intrusion Events
* Upgrade process of Sourcefire Sensors:
Reimage:
Reboot Sensor
Select System Restore
Set IP config
Select SCP, Enter Server IP, Credentials & ISO File name
Download & Mount ISO
Install
Reboot
* Screenos flow
* What is Sanity Checking?
* VPN
* NSRP Preempt behavior
* Proxy Server Experience
= ZScalar (Chd) =
DNS? need for DNS
Traffic troubleshooting
HTTP is in which layer?
DNS uses protocol? UDP & TCP
Why not use UDP for all DNS traffic? (Ans:Huge Overhead)
Reverse of DNS possible?
ScreenOS CPU utilization check command
Port no of DNS, SSH, HTTP
SSH access is there but WebUI not opening?
;2nd Level
302,403,401 error HTTP
SSL Handshake steps - 4 phases
Hashing vs Encryption, examples of protocols
Port Numbers - 80, 443
Proxy Server functions
ALG - Active vs Passive FTP
Destination NAT - Proxy ARP, Server issues, Debugging
If the Server does not have a reverse route to reach firewall,it will drop reply packet. Workaround is to create a Source NAT rule in firewall
Aggressive vs Main Mode
Is Preshared Key, ID shared in clear text in Aggressive mode? (no, its Hashed)
Dynamic IP in Site, Which mode is used? (Aggressive)
What is a Digital Signature?
= Convergys (JTAC L2) =
* VPN traffic is not reaching other gateway device? How to prove?
Ans:Take snoop simultaneusly at both sites.
* What filters to use for VPN Traffic?
Ans: 4 filters- two for & to the gateways, two to & for the PCs
* 4 VPNs between 2 devices, how to identify which packet is for which VPN?
Ans:SPI will be unique & remains same for a single VPN
* ESP has Port no?
* IMP:What is NAT-T? Why packet will drop without NAT-T? at which packet exchange will it drop?
Ans:At which packet level does it start using UDP port 4500?
*Scenario 1:
3 firewalls are in full mesh VPN. 2 firewalls A & B have overlapping subnets.
Why will the ping from A to B private IPs fail?
Will VPN come UP?
What is the solution?
Ans: to use MIP in Tunnel
Ping from A to C private IP will fail?
Ping from C to A private IP will fail?
*Scenario 2:
Client is conected to a L2 switch. Switch to Firewall. Firewall to Internet. Client does an active FTP connection to FTP server.
How will traffic pass through firewall?
What is the role of ALG?
Which command of FTP is used?
IMP:Which 2 parameters of FTP Command are useful?
Ans: 1. PORT Command; 2._________
*Troubleshoot Latency
*Fragmentation in detail(ID Field, MF flag, Frag Offset)
*TCP SACK
*TCP WSF? is it Unidirectional or bidirectional? Max value for WSF? Max Window size?
*You have two PCAP files for same firewall. One on Ingress port & one for Egress port.
How to find out latency? How to find packet drops? How to trace packets(ID Field)
= TechM (Chd) =
* Ph1 Configuration steps
* Ph1 Troubleshooting
* Traffic not reaching Destination roubleshooting
* NAT in ScreenOS
* VIP
* Nat DST
* DIP
* Troubleshooting VPN
* Commands in ScreenOS
* TCP in juniper srx flow
= Akamai =
* Detailed data transfer(http/ftp) steps
* EC Window, CWR
* 3-way handshake (Sequence number was wrong)
* Acknowledgment field value in a Syn Packet
* Window size=0; what conditions
Server is overloaded
Window scaling is not supported or configured
Some old OS in use by server
* Fields in a TCP & IP Header
= Iopex =
* IP Header Fields, Flags & length
* TCP Header Fields, Flags & length
* How ICMP will recognize reply message? Identification field
* Where Segmentation occurs
* What is MTU
* URG vs Push Flag
* Data Offset
* NAT-T
* DORA
* DHCP Relay
* Use of GARP
* Port no of Telnet, SMTP, FTP
* Why FTP uses 2 ports
* Phase 1 parameters
* Phase 1 errors
'''If Proxy ID mismatch occurs, will VPN come up or just data will not transfer?'''
IKE Phase 1 successful, Phase 2 fails due to proxy-id mismatch
The Proxy ID on the local and remote VPN device must match for phase 2 to complete the VPN negotiations
* Use of Inverse ARP(Frame Relay)
* Scenario: Ping from PC1 to PC2 - Explain ARP, IP, MAC table, etc
[PC1]------[SW]------[Router]------[PC2]
= Arcesium =
* What does Directory Execute (x) permission means? ability to 'cd' into that dir
* Which cmd sets max size of core dumps? ulimit
* Which cmd used to inspect system call made by running proces?
strace
ptrace ?
lsof ?
* In bash which cmd used to execute a shel script in current shel context?
source
exec
'.'
all of the above ?
* Print top 5 lines
cat foo.txt | head -5
head -5 foo.txt
* Redirect error stream to file errors? foo2>errors?
* Command used to create a new process? fork()
* Command to continue process after closing terminal? nohup
* init was replace by which default service manager in RHEL? systemd
* Check env variables of a running process?
env
htop
/proc FS
all of the abpve?
* Web Server can do what?
caching
LB ?
Proxy
URL Rewrite
* HTTP/2 was inspired by what? SPDY
* Most commonly used compression in response from server to client in HTTP? gzip
= Interview Questionaire =
;General
* Benefit of using Transparent mode?
* Basic difference between IDS & IPS?
* SSL VPN
* Phase 1,2 no of packets? encryption starts at which packet in VPN?
* PFS
* VPN Troubleshooting
* Stateful Inspection
* Aggressive mode / Main mode more secure?
* Task/Flow CPU High
* Reasons for High Memory?
;ScreenOS
* Flow in Netsreen firewall
* MIP vs VIP
* Multi-Cell policy
* Traffic Shapping is config where?
* 100 VPNs terminating on the Juniper firewall? Filter
* Pseudo session ?
* Snoop Detail?
* Debug flow basic
* Precautions while debugging
* Sync NSRP devices manually
* NSRP non-propagating parameters
* How to avoid Split-Brain scenario?
* How to avoid No Brain scenario?
* Secondary path in NSRP
= Achievements =
* Rockman Cyberoam ARP script
* Rockman Nagios Monitoring
* Wipro BP SRX & NSM Repro
* Citrix SDWAN VoIP repro
* Citrix CodeRed - PHP/Laravel
* AVI Case Alert script
* AVI config Parser
* AWS VPN Log Parser
* Endian Firewall Deployments
* NIC Snort IDS
* NIC Nessus Vulnerability
* Citrix SDWAN SME/Dev Deployment
* Cloudwatch Alarm S3 Bucket Objects Lambda function
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