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시작하기networking-skill
Network protocols and troubleshooting - TCP/IP, DNS, HTTP/HTTPS, SSH, firewalls.
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업데이트2025년 12월 30일 11:44
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Network protocols and troubleshooting - TCP/IP, DNS, HTTP/HTTPS, SSH, firewalls.
| name | networking-skill |
| description | Network protocols and troubleshooting - TCP/IP, DNS, HTTP/HTTPS, SSH, firewalls. |
| sasmp_version | 1.3.0 |
| bonded_agent | 02-networking-protocols |
| bond_type | PRIMARY_BOND |
| parameters | [{"name":"protocol","type":"string","required":false,"enum":["tcp","udp","http","https","dns","ssh","all"],"default":"all"},{"name":"operation","type":"string","required":true,"enum":["diagnose","configure","secure","monitor"]}] |
| retry_config | {"strategy":"exponential_backoff","initial_delay_ms":1000,"max_retries":3} |
| observability | {"logging":"structured","metrics":"enabled"} |
Master networking fundamentals for DevOps infrastructure management.
| Name | Type | Required | Default | Description |
|---|---|---|---|---|
| protocol | string | No | all | Protocol focus |
| operation | string | Yes | - | Operation type |
# DNS
dig +trace example.com
dig @8.8.8.8 example.com
host -t MX example.com
# TCP/IP Diagnostics
ping -c 4 host
traceroute host
ss -tuln
ip addr show
# HTTP Testing
curl -I https://example.com
curl -v https://example.com
# SSL/TLS
openssl s_client -connect host:443
openssl x509 -in cert.pem -text -noout
# SSH
ssh-keygen -t ed25519
ssh-copy-id user@host
ssh -L 8080:localhost:80 user@host
ssh -D 1080 user@host
# Firewall (UFW)
ufw status verbose
ufw allow 22/tcp
ufw deny from 192.168.1.100
# Firewall (iptables)
iptables -L -n -v
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
| Symptom | Root Cause | Solution |
|---|---|---|
| Connection refused | Service not running | Check ss -tuln |
| Connection timeout | Firewall/routing | Check firewall, traceroute |
| Name resolution failed | DNS issue | Check /etc/resolv.conf |
| Certificate error | Expired/invalid cert | Check dates, verify chain |
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