Network Engineering Stack Exchange
Network Engineering Stack Exchange

Most Popular

more tags
1500 questions
6
votes
2 answers

Is 2 devices connected via a switch equivalent to those 2 devices connected directly?

If just considering the basic functionality of a switch, can I say that 2 devices connected (via ethernet cable) to a switch, is functionally equivalent to having those 2 devices directly connected to each other via ethernet cable?
Rufus
  • 163
  • 2
6
votes
2 answers

Why are 802.11n data rates for 5GHz not faster than 2.4GHz?

Same protocol, different frequency. So why does 802.11 spec not take advantage of the higher frequency to obtain higher data rates?
elin05
  • 517
  • 1
  • 5
  • 14
6
votes
2 answers

Cascaded switches

Say I connected two 24x port Cisco switches together, to make 1 big 48 port layer 2 plane... all on the same network Say I wanted to get off this to another network, via a router. If that router is connected to Switch1, with the default gateway…
user10021657
  • 583
  • 2
  • 11
6
votes
2 answers

Issues with Juniper MX-series iBGP routes

I have a simple setup: 2x Juniper MX-Series routers each having one uplink to a transit provider iBGP session between both routers (point-to-point) For testing purposes I've disabled the uplink from R2 to the transit provider. All routes are…
WinkyWolly
  • 257
  • 2
  • 7
6
votes
1 answer

Why is there a separate set of 10 Gigabit fiber-optic transmission standards for WANs/SONET?

So, I'm reviewing the different IEEE transmission standards for an exam, and I've noticed that for the 10GBASE-X standards, there's two different sets of fiber-optic standards, 10GBASE-xW and 10GBASE-xR. It's noted that the W standards are for WANs…
Xovvo
  • 95
  • 5
6
votes
3 answers

Understanding ARP and Routers

Let's say there are two PCs, PC A and PC B. PC A wants to communicate with PC B, such as sending a message. I need to describe the arp packets for this task. Known details: PC A -> SW 1 -> Router -> SW 2 -> PC B Host A and host B are in a different…
NetworkNewbie
  • 63
  • 1
  • 1
  • 4
6
votes
1 answer

How does router advertisement in IPv6 avoid IP conflict?

If a router advertisement sends the range of subnet, and the client can choose an IP from it, how is there no conflict with another client that has chosen the same address?
Omer Anisfeld
  • 163
  • 6
6
votes
4 answers

How can I view bandwidth use by ip/host on a Cisco router?

My company has a 100mbps Internet connection and we have recently experienced extreme slowness when using the Internet (our provider's speedtest page indicated .25 Mbps download speed). When we contacted them about it, they said it's because our…
vrtigo1
  • 161
  • 1
  • 1
  • 2
6
votes
3 answers

What is the characteristic of spoofed ARP packets?

Hi what is the characteristic of spoofed ARP packets? I want to know how to detect it but before that I have to know how can I call a packet a spoofed packet. I hope you can help me thank you.
Tiffany
  • 85
  • 6
6
votes
2 answers

Ethernet padding value

When the data sent in an Ethernet frame is less than 46 bytes, extra padding needs to be added to the payload. The question is: Which is the value of that Ethernet padding? I'm asking since in real captures I checked this padding seems random,…
Boni García
  • 163
  • 1
  • 4
6
votes
1 answer

Cisco: storm-control unicast

Within a typical service provider environment I can see how broadcast and multicast storm control can be useful. I am confused regarding unicast storm control though. Reading the Cisco docs online they give examples such as protecting against port…
jwbensley
  • 5,290
  • 7
  • 37
  • 79
6
votes
4 answers

Why does it say, that a Switch can segregate the collision domain?

In general, the Ethernet Switch use RJ-45 link to connect the Hosts and the Switch uses Store and Forward mode. So, why is there a saying: Switch can segregate the collision domain I thought the Switch Store and Forward mode and RF-45's full…
qg_java_17137
  • 535
  • 1
  • 5
  • 12
6
votes
3 answers

OSPF Area Backbone(0) is Inactive

I am having a puzzling issue with OSPF connectivity on one of my routers. The other routers in my network have formed an adjacency and are working correctly, but this last one is a case I've never seen before. All of the interfaces on the remaining…
THE DOCTOR
  • 953
  • 4
  • 13
  • 25
6
votes
3 answers

How not to route on a Cisco router

So we have a router, with a switch card interface, 8 ports Say I have 4 VLANs (A,B,C,D) on it, with 2 switch ports in each. Each VLAN (i.e. all ports) can communicate with each other, because naturally they are all connected to the one router...…
user10021657
  • 583
  • 2
  • 11
6
votes
1 answer

Why do DHCP servers lease IP address based on Option-61 (Client-ID)?

Why do DHCP servers (specifically Cisco) use "Client-ID Options", not the CHADDR (client MAC) in the DHCP request, for static binding? From: Configuring DHCP All DHCP clients send a client identifier (DHCP option 61) in the DHCP packet. To…
t3mp
  • 710
  • 6
  • 8
1 2 3
…
99 100