System Commands Week 2 Graded Assignment Solutions

🖥️ System Commands Week 2 Graded Assignment Solutions

Version: v3_t12026_GradeBoost —
Comprehensive 4-in-1 guide covering Networking, Emacs, Vi Editor, and Virtual Machine management.

This downloadable PDF provides complete, verified solutions for the Week 2 Graded Assignments.
This week focuses on the essential tools for system administration, remote server management, and terminal-based text editing.

Detailed Question Summary

Each solution includes the technical logic and command behavior for the following 24 problems:

Section 2.1: Networking

• Q1: Network Addressing — Understanding the bit-size architecture of IP addresses and transport protocol port numbers.
• Q2: Port Monitoring — Identifying the standard utility used to display open network ports on a local machine.
• Q3: Domain Resolution — Analyzing the functionality of the nslookup command for retrieving server and IP information.
• Q4: Utility Mapping — Comprehensive overview of networking tools including ifconfig, ping, dig, traceroute, and wget.

Section 2.2: Text Editors (Emacs & Vi)

• Q1 (Emacs): Command Validation — Distinguishing between correct and incorrect keyboard sequences for saving buffers and exiting the editor.
• Q2 (Emacs): Cursor Path Tracing — Predicting final pointer coordinates after a sequence of navigation commands (C-a, C-e, C-n, etc.).
• Q3 (Emacs): Line Navigation — The specific M-x sequence required to jump to a precise line number in a large file.
• Q4 (Emacs): Global Navigation — Mapping shortcuts for moving to the beginning/end of lines and the start/end of a file.
• Q1 (Vi): In-Place Editing — Executing copy and paste operations for single characters while in insert mode.
• Q2 (Vi): Mode Transitions — Identifying the specific trigger to enter insert mode at the absolute beginning of a line.
• Q3 (Vi): Bulk Deletion — Mastering numeric prefixes to delete multiple consecutive lines in navigation mode.
• Q4 (Vi): Global Search & Replace — Decoding complex strings (:%s/gci) involving case-insensitivity and user confirmation flags.
• Q5 (Vi): Editor State Management — Mapping commands for line numbering, forced quitting, and saving.

Section 2.3: Virtual Machines & SSH

• Q1: Public Key Authentication — Troubleshooting “Permission denied” errors related to SSH agents and file permissions.
• Q2: Host Identification — Analyzing security warnings regarding changed remote host identification and its underlying causes.
• Q3: Key Security — Identifying the specific chmod octal code required to secure private key files against “too open” permission errors.
• Q4: Verification Failures — Understanding why changing a VM’s IP or host key leads to verification errors.
• Q5: Key Database Management — Using ssh-keygen to remove stale or invalid host entries from the known_hosts file.
• Q6: Advanced Substitution — Using Vi global commands to perform conditional word deletions across an entire file.
• Q7: Automated Connectivity — The purpose of StrictHostKeyChecking=no in non-interactive SSH environments.

File Format:

• ☑ v3_t12026_GradeBoost: Complete verified solution set for all Week 2 topics.