The final test

E1 In one sentence, what is CT1's job inside 3GPP?

• To decide which features a mobile network should offer
• To write the exact conversation between a device and the core network
• To test that handsets from different makers work together

E2 A colleague hands you a document whose title ends in "Stage 3". What does that tell you before you open it?

• It is the third and final draft
• It describes the protocol — the messages and their contents — rather than the system architecture
• It has been approved by the parent group

E3 Which single specification has the most change documents against it over CT1's whole record?

• 24.501, the NAS protocol for the 5G System
• 24.229, the SIP-based call control protocol
• 24.301, the NAS protocol for the Evolved Packet System

E4 You need to know how long a device waits after sending a REGISTRATION REQUEST, and the timer table disagrees with the procedure clause. Which do you follow?

• The timer table — it is the normative list of values
• Neither; the value is left to implementation
• The procedure clause — clauses 4 to 6 are the definitive descriptions

E5 What is the most common outcome for a document at a CT1 meeting, judging by C1-161?

• Revised
• Withdrawn
• Agreed

E6 Where does an approved change to TS 24.501 leave a permanent trace inside the document?

• In clause 2, the list of references
• In Annex F, the change history, with its number, category and new version
• Nowhere — only the changed clause shows it

E7 Somebody claims CT1 is the busiest working group in 3GPP. What can this course say about that?

• It is true — 4235 documents in a year is the highest count recorded
• It cannot be said from here: the register counts CT1 alone and holds no numbers for any other group
• It is false — RAN2 files more documents

E8 Why must an all-time document count and a twelve-month document count never be mixed?

• 7181 documents carry no upload date, so they are inside the all-time count and invisible to the yearly one
• The two are counted from different databases
• The all-time count includes planned meetings

E9 Which two ends of the network does the document CT1 is best known for describe the conversation between?

• The phone and the base station
• The phone and the core network functions that handle mobility and sessions
• Two operators' networks at a border

E10 What does the phrase "Stage 3" at the end of a specification title tell you?

• The document is still a draft, two stages from finished
• The document describes the protocol itself, not the architecture around it
• The document is the third edition

E11 How many CT1 specifications are active?

• 229
• 237
• 199

E12 Which two protocols does TS 24.501 carry side by side?

• Session management and charging
• Mobility management and session management
• Radio resource control and mobility management

E13 What is the difference between a CR and a pCR?

• A CR changes a published specification; a pCR changes one still being drafted
• A pCR is a rejected CR
• A CR is bigger; a pCR is a one-line correction

E14 How many documents were put to the meeting C1-161?

• 172
• 617
• 4235

E15 Somebody says "CT1 agreed that at C1-162". What is wrong with the sentence?

• C1-162 is not a CT1 meeting
• Nothing — documents are already filed under C1-162
• C1-162 has not started, so nothing has been agreed there