Network Engineering Stack Exchange is a question and answer site for network engineers. It only takes a minute to sign up.

Sign up to join this community
Anybody can ask a question
Anybody can answer
The best answers are voted up and rise to the top

Top Questions

15 votes
5 answers
4k views

Why do we need ports with IPv6?

5 votes
2 answers
578 views

Can a jumbogram (giant data packet) be used at a large scale (in WAN for example)?

4 votes
2 answers
545 views

Why is a virtual MAC address needed in FHRP protocols?

4 votes
1 answer
340 views

Layer choice for OSPF

3 votes
1 answer
132 views

A question about DR/BDR routers in OSPF

3 votes
2 answers
101 views

Show port on Cisco switch that mac address is being dropped on

1 vote
1 answer
118 views

Can a switch fragment a jumbo frame?

0 votes
2 answers
75 views

can we use RJ45 with cat7 sftp?

0 votes
1 answer
47 views

How to change the AS number without losing the old BGP configuration?

1 vote
1 answer
70 views

Hot potato routing topology

1 vote
1 answer
77 views

Does each computer/smart phone use electromagnetic wave with different frequency to communicate when they're connected to a WLAN?

0 votes
1 answer
42 views

Warning: portfast should only be enabled on ports connected to a single host

0 votes
1 answer
40 views

policy based routing to send one host to a different internet gateweay

1 vote
1 answer
59 views

Private VLAN: gateway and DHCP for isolated VLANs over multiple switches (Extreme)

1 vote
2 answers
34 views

Is it okay to not assign an IP address to the physical interface of router when used for "Router on a Stick"?

1 vote
1 answer
67 views

Cisco ASA not accepting external traffic without NAT configuration

0 votes
1 answer
37 views

Routing question

0 votes
1 answer
37 views

How would a switch know that it should forward a frame through a different interface in a STP topology?

1 vote
1 answer
47 views

How does QUIC provide delivery guarantee?

0 votes
2 answers
45 views

Adding switch to domain, do I need to use vlan

0 votes
1 answer
42 views

How does OSPF know the cost of the interfaces between the router and the destination network?

0 votes
2 answers
42 views

What is considered a LAN segment in this STP explanation?

0 votes
1 answer
48 views

What could be blocking ARP?

2 votes
1 answer
36 views

What is Ethernet MDI in the case of SFP interfaces

0 votes
2 answers
33 views

Cisco 2960-X IOS Version 15.2 can't use command access-session control-direction both

0 votes
1 answer
23 views

When a new entry in the NAT table is created and an entry in the NAT table is removed?

0 votes
1 answer
37 views

In a PE-CE network, we would redistribute routes between BGP and IGP without `bgp redistribute-internal`. How does redistribution works?

0 votes
1 answer
28 views

Can QUIC prevent DNS/NTP amplification for DDOS

2 votes
2 answers
45 views

TCP MSS - Dynamic Adjustment

1 vote
1 answer
27 views

Why does TCP sender drop rate 50% on lost-packets?

1 vote
2 answers
34 views

Why do 802.1Q trunk ports drop tagged frames with the same ID as the native VLAN?

0 votes
1 answer
41 views

Why there is not layer3 in Mark's laptop?

1 vote
1 answer
27 views

What happens if the layer 2 destination MAC address mismatches?

0 votes
1 answer
34 views

Naming ASN something else than "default", Cisco IOS XR

0 votes
1 answer
32 views

Why should we replicate route before doing inter-vrf redistribution

0 votes
0 answers
32 views

How to NAT a unicast address to a broadcast address?

0 votes
1 answer
19 views

iBGP running only between BGP border routers?

0 votes
1 answer
31 views

Policy Based Routing on Cisco Nexus 9300

0 votes
1 answer
22 views

Many SYN_RECV connections in netstat [closed]

0 votes
0 answers
26 views

(Wireshark) how to filter TCP connections

0 votes
1 answer
19 views

Understanding output of "ip route get" [closed]

0 votes
2 answers
20 views

wireshark is not capturing my target packets

0 votes
0 answers
19 views

Difference between host-to-host and process-to-process communication [closed]

0 votes
1 answer
19 views

Where are the GCP Firewall logs?

0 votes
0 answers
19 views

Hide FTP login details from the running config

0 votes
0 answers
19 views

How can I find or produce 60s style rack mount panels? [closed]

0 votes
0 answers
18 views

Subnetting within an existing Production subnet [closed]

0 votes
0 answers
17 views

ACL to allow just Internet access to include DHCP and DNS [closed]


Looking for more? Browse the complete list of questions, or popular tags. Help us answer unanswered questions.