Ungyi Tech

Rip 1:no subnettingBroadcastauthentication unavailable Ripv2:subnetting supportmulticastAuthentication Router Poisoning. advertise false value to prevent waste of bandwidth. show ip protocolint s 1/0ip rip send version 2orrouter ripversion 2 router ripno auto-summary #disable automatic network summarization

causes: windows game mode try/ wait to record chrome. Problem: laggy in overall, youtube stops every second. I notices that when chrome is minimized, the usage drops. Solution: turn of windows gaming mode that runs in background. Especially Game DVR mode. Idle usage of gpu is about 8% (laptop, G4560, 1080p dual monitor)

class Fruit(object): """A class that makes various tasty fruits.""" def __init__(self, name, color, flavor, poisonous): self.name = name self.color = color self.flavor = flavor self.poisonous = poisonous def description(self): print "I'm a %s %s and I taste %s." % (self.color, self.name, self.flavor) def is_edible(self): if not self.poisonous: print "Yep! I'm edible." else: print "Don't eat me! ..

Hub and spoke network Loopback in router Int loopback10 //make loopback address Ip address 11.1.1.1 255.255.255.0 //assign ip address Exit Show int loopback10 You can’t assign 127.x.x.x address because it’s dedicated to loopback. Although the interface you try to is loopback. No int loopback 10 //delete loopback int R2 to R3 need to go through R1. Round-trip time is doubled. Debug ip packet // e..

print 5 >> 4 # Right Shift #0print 5 > 2 shift_left = shift_left

DNS – translate domain name to ip address ARP - Address Resolution Protocol, set list of mac address that connected to ip address. In router, show ip arp. In PC, arp -a. DHCP – Discover, Offer, Request, Acknowledgement

TCP/ UDP TCP Error correction/ recovery UDP No error detection, no window / Fast speed. -Audio and Video TCP – three-way handshake syn(synchronising), ack(acknowledgement) 2000-byte segment. Server request Seq 6000 as seq 6000 is missing.After receive seq 6000, acknowledge 10000 so host send seq 12000 next time without sending duplicates. Size of window is automatically negotiated between device..

garbled = "IXXX aXXmX aXXXnXoXXXXXtXhXeXXXXrX sXXXXeXcXXXrXeXt mXXeXsXXXsXaXXXXXXgXeX!XX" message = filter(lambda x: x!="X", garbled) print message #I am another secret message!letters = ['A', 'B', 'C', 'D', 'E'] print letters[::-1] #Output: ['E', 'D', 'C', 'B', 'A']

conf tint range f 0/1-12description See administrator for further configuration.