(1) By the Clerk. - When the plaintiff's claim against a defendant is for a sum certain or for a sum which can by computation be made certain, the clerk upon request of the plaintiff and upon affidavit of the amount due shall enter judgment for that amount and costs against the defendant, if the defendant has been defaulted for failure to appear and if the defendant is not an infant or incompetent person. A verified pleading may be used in lieu of an affidavit when the pleading contains information sufficient to determine or compute the sum certain. In all cases wherein, pursuant to this rule, the clerk enters judgment by default upon a claim for debt which is secured by any pledge, mortgage, deed of trust or other contractual security in respect of which foreclosure may be had, or upon a claim to enforce a lien for unpaid taxes or assessments, the clerk may likewise make all further orders required to consummate foreclosure in accordance with the procedure provided in Article 29A of Chapter 1 of the General Statutes, entitled "Judicial Sales.